42646950021 has 16 divisors (see below), whose sum is σ = 61264871360. Its totient is φ = 26232180480.

The previous prime is 42646950019. The next prime is 42646950097. The reversal of 42646950021 is 12005964624.

It is a happy number.

It is not a de Polignac number, because 42646950021 - 2¹ = 42646950019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42646950001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165940 + ... + 335901.

It is an arithmetic number, because the mean of its divisors is an integer number (3829054460).

Almost surely, 2^42646950021 is an apocalyptic number.

It is an amenable number.

42646950021 is a deficient number, since it is larger than the sum of its proper divisors (18617921339).

42646950021 is a wasteful number, since it uses less digits than its factorization.

42646950021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504036.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 42646950021 in words is "forty-two billion, six hundred forty-six million, nine hundred fifty thousand, twenty-one".