21232170523 has 32 divisors (see below), whose sum is σ = 22786790400. Its totient is φ = 19758226176.

The previous prime is 21232170517. The next prime is 21232170541. The reversal of 21232170523 is 32507123212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232170523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232170491 and 21232170500.

It is not an unprimeable number, because it can be changed into a prime (21232170563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10727748 + ... + 10729726.

It is an arithmetic number, because the mean of its divisors is an integer number (712087200).

Almost surely, 2^21232170523 is an apocalyptic number.

21232170523 is a deficient number, since it is larger than the sum of its proper divisors (1554619877).

21232170523 is a wasteful number, since it uses less digits than its factorization.

21232170523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 21232170523 its reverse (32507123212), we get a palindrome (53739293735).

The spelling of 21232170523 in words is "twenty-one billion, two hundred thirty-two million, one hundred seventy thousand, five hundred twenty-three".