21120002210020 has 48 divisors (see below), whose sum is σ = 50701997138688. Its totient is φ = 7239144781440.

The previous prime is 21120002209967. The next prime is 21120002210039. The reversal of 21120002210020 is 2001220002112.

It is a happy 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, 20312151 + ... + 21326590.

It is an arithmetic number, because the mean of its divisors is an integer number (1056291607056).

Almost surely, 2^{21120002210020} is an apocalyptic number.

21120002210020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120002210020 is an abundant number, since it is smaller than the sum of its proper divisors (29581994928668).

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

21120002210020 is a wasteful number, since it uses less digits than its factorization.

21120002210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41642380 (or 41642378 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21120002210020 its reverse (2001220002112), we get a palindrome (23121222212132).

The spelling of 21120002210020 in words is "twenty-one trillion, one hundred twenty billion, two million, two hundred ten thousand, twenty".