21023212232 has 32 divisors (see below), whose sum is σ = 43047892800. Its totient is φ = 9545812800.

The previous prime is 21023212213. The next prime is 21023212267. The reversal of 21023212232 is 23221232012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44132 + ... + 209747.

It is an arithmetic number, because the mean of its divisors is an integer number (1345246650).

Almost surely, 2^21023212232 is an apocalyptic number.

21023212232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21023212232 is an abundant number, since it is smaller than the sum of its proper divisors (22024680568).

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

21023212232 is a wasteful number, since it uses less digits than its factorization.

21023212232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254837 (or 254833 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21023212232 its reverse (23221232012), we get a palindrome (44244444244).

The spelling of 21023212232 in words is "twenty-one billion, twenty-three million, two hundred twelve thousand, two hundred thirty-two".