21112112101020 has 96 divisors (see below), whose sum is σ = 59213241658368. Its totient is φ = 5620442802432.

The previous prime is 21112112101009. The next prime is 21112112101109. The reversal of 21112112101020 is 2010121121112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113862427 + ... + 114047693.

It is an arithmetic number, because the mean of its divisors is an integer number (616804600608).

Almost surely, 2^{21112112101020} is an apocalyptic number.

21112112101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112112101020 is an abundant number, since it is smaller than the sum of its proper divisors (38101129557348).

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

21112112101020 is a wasteful number, since it uses less digits than its factorization.

21112112101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188459 (or 188457 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21112112101020 its reverse (2010121121112), we get a palindrome (23122233222132).

The spelling of 21112112101020 in words is "twenty-one trillion, one hundred twelve billion, one hundred twelve million, one hundred one thousand, twenty".