21212011232 has 24 divisors (see below), whose sum is σ = 41805027936. Its totient is φ = 10594861312.

The previous prime is 21212011187. The next prime is 21212011243. The reversal of 21212011232 is 23211021212.

It is a self number, because there is not a number n which added to its sum of digits gives 21212011232.

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, 317288 + ... + 378279.

It is an arithmetic number, because the mean of its divisors is an integer number (1741876164).

Almost surely, 2^21212011232 is an apocalyptic number.

It is an amenable number.

21212011232 is a deficient number, since it is larger than the sum of its proper divisors (20593016704).

21212011232 is an equidigital number, since it uses as much as digits as its factorization.

21212011232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696530 (or 696522 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21212011232 its reverse (23211021212), we get a palindrome (44423032444).

The spelling of 21212011232 in words is "twenty-one billion, two hundred twelve million, eleven thousand, two hundred thirty-two".