2100212120121 has 32 divisors (see below), whose sum is σ = 2883713648640. Its totient is φ = 1358632626624.

The previous prime is 2100212120101. The next prime is 2100212120131. The reversal of 2100212120121 is 1210212120012.

It is not a de Polignac number, because 2100212120121 - 2²³ = 2100203731513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2100212120121.

It is not an unprimeable number, because it can be changed into a prime (2100212120101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131923200 + ... + 131939118.

It is an arithmetic number, because the mean of its divisors is an integer number (90116051520).

Almost surely, 2^{2100212120121} is an apocalyptic number.

It is an amenable number.

2100212120121 is a deficient number, since it is larger than the sum of its proper divisors (783501528519).

2100212120121 is a wasteful number, since it uses less digits than its factorization.

2100212120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19085.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2100212120121 its reverse (1210212120012), we get a palindrome (3310424240133).

The spelling of 2100212120121 in words is "two trillion, one hundred billion, two hundred twelve million, one hundred twenty thousand, one hundred twenty-one".