201121022251 has 2 divisors, whose sum is σ = 201121022252. Its totient is φ = 201121022250.

The previous prime is 201121022243. The next prime is 201121022261. The reversal of 201121022251 is 152220121102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201121022251 - 2³ = 201121022243 is a prime.

It is not a weakly prime, because it can be changed into another prime (201121022261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560511125 + 100560511126.

It is an arithmetic number, because the mean of its divisors is an integer number (100560511126).

Almost surely, 2^201121022251 is an apocalyptic number.

201121022251 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121022251 is an equidigital number, since it uses as much as digits as its factorization.

201121022251 is an evil number, because the sum of its binary digits is even.

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

Adding to 201121022251 its reverse (152220121102), we get a palindrome (353341143353).

The spelling of 201121022251 in words is "two hundred one billion, one hundred twenty-one million, twenty-two thousand, two hundred fifty-one".