21231802607 has 8 divisors (see below), whose sum is σ = 21689436096. Its totient is φ = 20774414752.

The previous prime is 21231802601. The next prime is 21231802621. The reversal of 21231802607 is 70620813212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21231802607 - 2⁸ = 21231802351 is a prime.

It is a super-2 number, since 2×21231802607² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231802601) 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 7 ways as a sum of consecutive naturals, for example, 118973 + ... + 237945.

It is an arithmetic number, because the mean of its divisors is an integer number (2711179512).

Almost surely, 2^21231802607 is an apocalyptic number.

21231802607 is the 118973-rd pentagonal number.

21231802607 is a deficient number, since it is larger than the sum of its proper divisors (457633489).

21231802607 is a wasteful number, since it uses less digits than its factorization.

21231802607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122817.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 21231802607 in words is "twenty-one billion, two hundred thirty-one million, eight hundred two thousand, six hundred seven".