21232342520 has 16 divisors (see below), whose sum is σ = 47772770760. Its totient is φ = 8492936992.

The previous prime is 21232342499. The next prime is 21232342553. The reversal of 21232342520 is 2524323212.

It is a self number, because there is not a number n which added to its sum of digits gives 21232342520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265404242 + ... + 265404321.

Almost surely, 2^21232342520 is an apocalyptic number.

21232342520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232342520 is an abundant number, since it is smaller than the sum of its proper divisors (26540428240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232342520 is a wasteful number, since it uses less digits than its factorization.

21232342520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530808574 (or 530808570 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21232342520 its reverse (2524323212), we get a palindrome (23756665732).

The spelling of 21232342520 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, five hundred twenty".