21120110000020 has 24 divisors (see below), whose sum is σ = 44352958150368. Its totient is φ = 8447905495200.

The previous prime is 21120109999973. The next prime is 21120110000021. The reversal of 21120110000020 is 2000001102112.

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 = 21120109999961 and 21120110000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120110000021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7401726 + ... + 9850165.

It is an arithmetic number, because the mean of its divisors is an integer number (1848039922932).

Almost surely, 2^{21120110000020} is an apocalyptic number.

21120110000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120110000020 is an abundant number, since it is smaller than the sum of its proper divisors (23232848150348).

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

21120110000020 is a wasteful number, since it uses less digits than its factorization.

21120110000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17313111 (or 17313109 counting only the distinct ones).

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

Adding to 21120110000020 its reverse (2000001102112), we get a palindrome (23120111102132).

The spelling of 21120110000020 in words is "twenty-one trillion, one hundred twenty billion, one hundred ten million, twenty", and thus it is an aban number.