421204061689 has 4 divisors (see below), whose sum is σ = 421348858020. Its totient is φ = 421059265360.

The previous prime is 421204061671. The next prime is 421204061717. The reversal of 421204061689 is 986160402124.

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 383458177600 + 37745884089 = 619240^2 + 194283^2 .

It is a cyclic number.

It is not a de Polignac number, because 421204061689 - 2¹⁹ = 421203537401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421204061639) 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, 72393802 + ... + 72399619.

It is an arithmetic number, because the mean of its divisors is an integer number (105337214505).

Almost surely, 2^421204061689 is an apocalyptic number.

It is an amenable number.

421204061689 is a deficient number, since it is larger than the sum of its proper divisors (144796331).

421204061689 is a wasteful number, since it uses less digits than its factorization.

421204061689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144796330.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 421204061689 in words is "four hundred twenty-one billion, two hundred four million, sixty-one thousand, six hundred eighty-nine".