2100000202921 has 2 divisors, whose sum is σ = 2100000202922. Its totient is φ = 2100000202920.

The previous prime is 2100000202913. The next prime is 2100000202943. The reversal of 2100000202921 is 1292020000012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1738481805225 + 361518397696 = 1318515^2 + 601264^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100000202921 - 2³ = 2100000202913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100000902921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050000101460 + 1050000101461.

It is an arithmetic number, because the mean of its divisors is an integer number (1050000101461).

Almost surely, 2^{2100000202921} is an apocalyptic number.

It is an amenable number.

2100000202921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100000202921 is an equidigital number, since it uses as much as digits as its factorization.

2100000202921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2100000202921 its reverse (1292020000012), we get a palindrome (3392020202933).

The spelling of 2100000202921 in words is "two trillion, one hundred billion, two hundred two thousand, nine hundred twenty-one".