21112202012 has 48 divisors (see below), whose sum is σ = 42792841728. Its totient is φ = 9007230720.

The previous prime is 21112201991. The next prime is 21112202093. The reversal of 21112202012 is 21020221112.

It is a super-4 number, since 4×21112202012⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

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, 236063 + ... + 312969.

It is an arithmetic number, because the mean of its divisors is an integer number (891517536).

Almost surely, 2^21112202012 is an apocalyptic number.

21112202012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21112202012 is an abundant number, since it is smaller than the sum of its proper divisors (21680639716).

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

21112202012 is a wasteful number, since it uses less digits than its factorization.

21112202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77306 (or 77304 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21112202012 its reverse (21020221112), we get a palindrome (42132423124).

The spelling of 21112202012 in words is "twenty-one billion, one hundred twelve million, two hundred two thousand, twelve".