21212113032 has 128 divisors (see below), whose sum is σ = 67074048000. Its totient is φ = 6148422720.

The previous prime is 21212113007. The next prime is 21212113049. The reversal of 21212113032 is 23031121212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21212112996 and 21212113014.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139432 + ... + 248727.

It is an arithmetic number, because the mean of its divisors is an integer number (524016000).

Almost surely, 2^21212113032 is an apocalyptic number.

21212113032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21212113032 is an abundant number, since it is smaller than the sum of its proper divisors (45861934968).

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

21212113032 is a wasteful number, since it uses less digits than its factorization.

21212113032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388208 (or 388198 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21212113032 its reverse (23031121212), we get a palindrome (44243234244).

The spelling of 21212113032 in words is "twenty-one billion, two hundred twelve million, one hundred thirteen thousand, thirty-two".