21235413252 has 48 divisors (see below), whose sum is σ = 52695195840. Its totient is φ = 6632727552.

The previous prime is 21235413239. The next prime is 21235413263. The reversal of 21235413252 is 25231453212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182977 + ... + 275592.

It is an arithmetic number, because the mean of its divisors is an integer number (1097816580).

Almost surely, 2^21235413252 is an apocalyptic number.

It is an amenable number.

21235413252 is an abundant number, since it is smaller than the sum of its proper divisors (31459782588).

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

21235413252 is a wasteful number, since it uses less digits than its factorization.

21235413252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458820 (or 458818 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

Adding to 21235413252 its reverse (25231453212), we get a palindrome (46466866464).

The spelling of 21235413252 in words is "twenty-one billion, two hundred thirty-five million, four hundred thirteen thousand, two hundred fifty-two".