21121100232 has 16 divisors (see below), whose sum is σ = 52802750640. Its totient is φ = 7040366736.

The previous prime is 21121100227. The next prime is 21121100243. The reversal of 21121100232 is 23200112112.

It is a super-2 number, since 2×21121100232² (a number of 21 digits) contains 22 as substring.

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, 440022898 + ... + 440022945.

It is an arithmetic number, because the mean of its divisors is an integer number (3300171915).

Almost surely, 2^21121100232 is an apocalyptic number.

It is an amenable number.

21121100232 is an abundant number, since it is smaller than the sum of its proper divisors (31681650408).

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

21121100232 is a wasteful number, since it uses less digits than its factorization.

21121100232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880045852 (or 880045848 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21121100232 its reverse (23200112112), we get a palindrome (44321212344).

The spelling of 21121100232 in words is "twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred thirty-two".