21121201112 has 32 divisors (see below), whose sum is σ = 43210469520. Its totient is φ = 9598765440.

The previous prime is 21121201109. The next prime is 21121201151. The reversal of 21121201112 is 21110212112.

It is a super-2 number, since 2×21121201112² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 533258 + ... + 571494.

Almost surely, 2^21121201112 is an apocalyptic number.

21121201112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21121201112 is an abundant number, since it is smaller than the sum of its proper divisors (22089268408).

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

21121201112 is a wasteful number, since it uses less digits than its factorization.

21121201112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44531 (or 44527 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121201112 its reverse (21110212112), we get a palindrome (42231413224).

The spelling of 21121201112 in words is "twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred twelve".