21210121020112 has 40 divisors (see below), whose sum is σ = 41310801510912. Its totient is φ = 10549271808000.

The previous prime is 21210121020071. The next prime is 21210121020173. The reversal of 21210121020112 is 21102012101212.

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 7 ways as a sum of consecutive naturals, for example, 188349168 + ... + 188461744.

Almost surely, 2^{21210121020112} is an apocalyptic number.

It is an amenable number.

21210121020112 is a deficient number, since it is larger than the sum of its proper divisors (20100680490800).

21210121020112 is a wasteful number, since it uses less digits than its factorization.

21210121020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174427 (or 174421 counting only the distinct ones).

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

Adding to 21210121020112 its reverse (21102012101212), we get a palindrome (42312133121324).

The spelling of 21210121020112 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, twenty thousand, one hundred twelve".