21002220110020 has 12 divisors (see below), whose sum is σ = 44104662231084. Its totient is φ = 8400888044000.

The previous prime is 21002220109999. The next prime is 21002220110041. The reversal of 21002220110020 is 2001102220012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21002220109999) and next prime (21002220110041).

It can be written as a sum of positive squares in 2 ways, for example, as 7233474798144 + 13768745311876 = 2689512^2 + 3710626^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525055502731 + ... + 525055502770.

It is an arithmetic number, because the mean of its divisors is an integer number (3675388519257).

Almost surely, 2^{21002220110020} is an apocalyptic number.

21002220110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002220110020 is an abundant number, since it is smaller than the sum of its proper divisors (23102442121064).

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

21002220110020 is a wasteful number, since it uses less digits than its factorization.

21002220110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050111005510 (or 1050111005508 counting only the distinct ones).

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

Adding to 21002220110020 its reverse (2001102220012), we get a palindrome (23003322330032).

It can be divided in two parts, 21002 and 220110020, that added together give a palindrome (220131022).

The spelling of 21002220110020 in words is "twenty-one trillion, two billion, two hundred twenty million, one hundred ten thousand, twenty".