42680919901621 has 4 divisors (see below), whose sum is σ = 43721917948044. Its totient is φ = 41639921855200.

The previous prime is 42680919901597. The next prime is 42680919901639. The reversal of 42680919901621 is 12610991908624.

42680919901621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1751954020996 + 40928965880625 = 1323614^2 + 6397575^2 .

It is a cyclic number.

It is not a de Polignac number, because 42680919901621 - 2¹¹ = 42680919899573 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42680919901681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520499023150 + ... + 520499023231.

It is an arithmetic number, because the mean of its divisors is an integer number (10930479487011).

Almost surely, 2^{42680919901621} is an apocalyptic number.

42680919901621 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

42680919901621 is a deficient number, since it is larger than the sum of its proper divisors (1040998046423).

42680919901621 is a wasteful number, since it uses less digits than its factorization.

42680919901621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040998046422.

The product of its (nonzero) digits is 3359232, while the sum is 58.

The spelling of 42680919901621 in words is "forty-two trillion, six hundred eighty billion, nine hundred nineteen million, nine hundred one thousand, six hundred twenty-one".