521152502220431 has 4 divisors (see below), whose sum is σ = 532240853331552. Its totient is φ = 510064151109312.

The previous prime is 521152502220403. The next prime is 521152502220479. The reversal of 521152502220431 is 134022205251125.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521152502220431 is a prime.

It is a super-2 number, since 2×521152502220431² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521152502220391 and 521152502220400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521152502220401) 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, 5544175555490 + ... + 5544175555583.

It is an arithmetic number, because the mean of its divisors is an integer number (133060213332888).

Almost surely, 2^{521152502220431} is an apocalyptic number.

521152502220431 is a deficient number, since it is larger than the sum of its proper divisors (11088351111121).

521152502220431 is a wasteful number, since it uses less digits than its factorization.

521152502220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11088351111120.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 521152502220431 its reverse (134022205251125), we get a palindrome (655174707471556).

The spelling of 521152502220431 in words is "five hundred twenty-one trillion, one hundred fifty-two billion, five hundred two million, two hundred twenty thousand, four hundred thirty-one".