201021100001251 has 2 divisors, whose sum is σ = 201021100001252. Its totient is φ = 201021100001250.

The previous prime is 201021100001153. The next prime is 201021100001303. The reversal of 201021100001251 is 152100001120102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201021100001251 - 2²⁷ = 201020965783523 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021100001951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510550000625 + 100510550000626.

It is an arithmetic number, because the mean of its divisors is an integer number (100510550000626).

Almost surely, 2^{201021100001251} is an apocalyptic number.

201021100001251 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021100001251 is an equidigital number, since it uses as much as digits as its factorization.

201021100001251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 201021100001251 its reverse (152100001120102), we get a palindrome (353121101121353).

The spelling of 201021100001251 in words is "two hundred one trillion, twenty-one billion, one hundred million, one thousand, two hundred fifty-one".