21120000101020 has 48 divisors (see below), whose sum is σ = 44703259776000. Its totient is φ = 8381312471360.

The previous prime is 21120000100951. The next prime is 21120000101063. The reversal of 21120000101020 is 2010100002112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21120000100988 and 21120000101006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5300920 + ... + 8386879.

It is an arithmetic number, because the mean of its divisors is an integer number (931317912000).

Almost surely, 2^{21120000101020} is an apocalyptic number.

21120000101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120000101020 is an abundant number, since it is smaller than the sum of its proper divisors (23583259674980).

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

21120000101020 is a wasteful number, since it uses less digits than its factorization.

21120000101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13688418 (or 13688416 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21120000101020 its reverse (2010100002112), we get a palindrome (23130100103132).

The spelling of 21120000101020 in words is "twenty-one trillion, one hundred twenty billion, one hundred one thousand, twenty".