2100200021251 has 2 divisors, whose sum is σ = 2100200021252. Its totient is φ = 2100200021250.

The previous prime is 2100200021221. The next prime is 2100200021279. The reversal of 2100200021251 is 1521200020012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2100200021251 - 2¹⁷ = 2100199890179 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100200021221) 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 as a sum of consecutive naturals, namely, 1050100010625 + 1050100010626.

It is an arithmetic number, because the mean of its divisors is an integer number (1050100010626).

Almost surely, 2^{2100200021251} is an apocalyptic number.

2100200021251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100200021251 is an equidigital number, since it uses as much as digits as its factorization.

2100200021251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 2100200021251 its reverse (1521200020012), we get a palindrome (3621400041263).

The spelling of 2100200021251 in words is "two trillion, one hundred billion, two hundred million, twenty-one thousand, two hundred fifty-one".