201021022100251 has 2 divisors, whose sum is σ = 201021022100252. Its totient is φ = 201021022100250.

The previous prime is 201021022100221. The next prime is 201021022100267. The reversal of 201021022100251 is 152001220120102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201021022100251 - 2⁷ = 201021022100123 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021022100201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510511050125 + 100510511050126.

It is an arithmetic number, because the mean of its divisors is an integer number (100510511050126).

Almost surely, 2^{201021022100251} is an apocalyptic number.

201021022100251 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021022100251 is an equidigital number, since it uses as much as digits as its factorization.

201021022100251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 201021022100251 its reverse (152001220120102), we get a palindrome (353022242220353).

The spelling of 201021022100251 in words is "two hundred one trillion, twenty-one billion, twenty-two million, one hundred thousand, two hundred fifty-one".