2100210021220 has 24 divisors (see below), whose sum is σ = 4410485025408. Its totient is φ = 840075631200.

The previous prime is 2100210021211. The next prime is 2100210021227. The reversal of 2100210021220 is 221200120012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2100210021220.

It is not an unprimeable number, because it can be changed into a prime (2100210021227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1779205 + ... + 2714035.

It is an arithmetic number, because the mean of its divisors is an integer number (183770209392).

Almost surely, 2^{2100210021220} is an apocalyptic number.

2100210021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100210021220 is an abundant number, since it is smaller than the sum of its proper divisors (2310275004188).

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

2100210021220 is a wasteful number, since it uses less digits than its factorization.

2100210021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047171 (or 1047169 counting only the distinct ones).

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

Adding to 2100210021220 its reverse (221200120012), we get a palindrome (2321410141232).

The spelling of 2100210021220 in words is "two trillion, one hundred billion, two hundred ten million, twenty-one thousand, two hundred twenty".