2101220100251 has 2 divisors, whose sum is σ = 2101220100252. Its totient is φ = 2101220100250.

The previous prime is 2101220100209. The next prime is 2101220100271. The reversal of 2101220100251 is 1520010221012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101220100251 - 2²² = 2101215905947 is a prime.

It is not a weakly prime, because it can be changed into another prime (2101220100271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050610050125 + 1050610050126.

It is an arithmetic number, because the mean of its divisors is an integer number (1050610050126).

Almost surely, 2^{2101220100251} is an apocalyptic number.

2101220100251 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101220100251 is an equidigital number, since it uses as much as digits as its factorization.

2101220100251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 2101220100251 its reverse (1520010221012), we get a palindrome (3621230321263).

The spelling of 2101220100251 in words is "two trillion, one hundred one billion, two hundred twenty million, one hundred thousand, two hundred fifty-one".