2100200000121 has 24 divisors (see below), whose sum is σ = 3065077177344. Its totient is φ = 1385617363200.

The previous prime is 2100200000027. The next prime is 2100200000123. The reversal of 2100200000121 is 1210000020012.

It is not a de Polignac number, because 2100200000121 - 2⁷ = 2100199999993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (2100200000123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17160696 + ... + 17282646.

It is an arithmetic number, because the mean of its divisors is an integer number (127711549056).

Almost surely, 2^{2100200000121} is an apocalyptic number.

It is an amenable number.

2100200000121 is a deficient number, since it is larger than the sum of its proper divisors (964877177223).

2100200000121 is a wasteful number, since it uses less digits than its factorization.

2100200000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141781 (or 141778 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 2100200000121 its reverse (1210000020012), we get a palindrome (3310200020133).

The spelling of 2100200000121 in words is "two trillion, one hundred billion, two hundred million, one hundred twenty-one", and thus it is an aban number.