21232342521 has 48 divisors (see below), whose sum is σ = 34514678016. Its totient is φ = 12479626368.

The previous prime is 21232342499. The next prime is 21232342553. The reversal of 21232342521 is 12524323212.

21232342521 is a `hidden beast` number, since 2 + 1 + 232 + 3 + 425 + 2 + 1 = 666.

It is not a de Polignac number, because 21232342521 - 2¹⁷ = 21232211449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21232343521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1950931 + ... + 1961783.

It is an arithmetic number, because the mean of its divisors is an integer number (719055792).

Almost surely, 2^21232342521 is an apocalyptic number.

It is an amenable number.

21232342521 is a deficient number, since it is larger than the sum of its proper divisors (13282335495).

21232342521 is a wasteful number, since it uses less digits than its factorization.

21232342521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11622 (or 11619 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

Adding to 21232342521 its reverse (12524323212), we get a palindrome (33756665733).

The spelling of 21232342521 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, five hundred twenty-one".