10642239521 has 4 divisors (see below), whose sum is σ = 10642778112. Its totient is φ = 10641700932.

The previous prime is 10642239493. The next prime is 10642239539. The reversal of 10642239521 is 12593224601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10642239521 - 2¹⁸ = 10641977377 is a prime.

It is a super-2 number, since 2×10642239521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10642239821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238481 + ... + 279566.

It is an arithmetic number, because the mean of its divisors is an integer number (2660694528).

Almost surely, 2^10642239521 is an apocalyptic number.

It is an amenable number.

10642239521 is a deficient number, since it is larger than the sum of its proper divisors (538591).

10642239521 is an equidigital number, since it uses as much as digits as its factorization.

10642239521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538590.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 10642239521 in words is "ten billion, six hundred forty-two million, two hundred thirty-nine thousand, five hundred twenty-one".