2155105220020 has 24 divisors (see below), whose sum is σ = 4526617179168. Its totient is φ = 861871380000.

The previous prime is 2155105219957. The next prime is 2155105220029. The reversal of 2155105220020 is 200225015512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155105220029) 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, 10565706 + ... + 10767745.

It is an arithmetic number, because the mean of its divisors is an integer number (188609049132).

Almost surely, 2^{2155105220020} is an apocalyptic number.

2155105220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155105220020 is an abundant number, since it is smaller than the sum of its proper divisors (2371511959148).

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

2155105220020 is a wasteful number, since it uses less digits than its factorization.

2155105220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21338511 (or 21338509 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 2155105220020 in words is "two trillion, one hundred fifty-five billion, one hundred five million, two hundred twenty thousand, twenty".