21002021111120 has 40 divisors (see below), whose sum is σ = 55805370382464. Its totient is φ = 7200692952192.

The previous prime is 21002021111087. The next prime is 21002021111147. The reversal of 21002021111120 is 2111112020012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21002021111095 and 21002021111104.

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, 18751804004 + ... + 18751805123.

Almost surely, 2^{21002021111120} is an apocalyptic number.

21002021111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002021111120 is an abundant number, since it is smaller than the sum of its proper divisors (34803349271344).

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

21002021111120 is a wasteful number, since it uses less digits than its factorization.

21002021111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37503609147 (or 37503609141 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21002021111120 its reverse (2111112020012), we get a palindrome (23113133131132).

The spelling of 21002021111120 in words is "twenty-one trillion, two billion, twenty-one million, one hundred eleven thousand, one hundred twenty".