21121212022112 has 24 divisors (see below), whose sum is σ = 41585440289400. Its totient is φ = 10559830361344.

The previous prime is 21121212022103. The next prime is 21121212022129. The reversal of 21121212022112 is 21122021212112.

It is a super-2 number, since 2×21121212022112² (a number of 27 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 3 ways as a sum of consecutive naturals, for example, 23796437 + ... + 24668052.

It is an arithmetic number, because the mean of its divisors is an integer number (1732726678725).

Almost surely, 2^{21121212022112} is an apocalyptic number.

It is an amenable number.

21121212022112 is a deficient number, since it is larger than the sum of its proper divisors (20464228267288).

21121212022112 is a wasteful number, since it uses less digits than its factorization.

21121212022112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48478118 (or 48478110 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21121212022112 its reverse (21122021212112), we get a palindrome (42243233234224).

The spelling of 21121212022112 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, twenty-two thousand, one hundred twelve".