21021200112112 has 20 divisors (see below), whose sum is σ = 40738629298696. Its totient is φ = 10508005454400.

The previous prime is 21021200112047. The next prime is 21021200112181. The reversal of 21021200112112 is 21121100212012.

It is a super-2 number, since 2×21021200112112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 162095763 + ... + 162225394.

Almost surely, 2^{21021200112112} is an apocalyptic number.

It is an amenable number.

21021200112112 is a deficient number, since it is larger than the sum of its proper divisors (19717429186584).

21021200112112 is a wasteful number, since it uses less digits than its factorization.

21021200112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324325216 (or 324325210 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021200112112 its reverse (21121100212012), we get a palindrome (42142300324124).

The spelling of 21021200112112 in words is "twenty-one trillion, twenty-one billion, two hundred million, one hundred twelve thousand, one hundred twelve".