201211212157 has 2 divisors, whose sum is σ = 201211212158. Its totient is φ = 201211212156.

The previous prime is 201211212077. The next prime is 201211212197. The reversal of 201211212157 is 751212112102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201057179236 + 154032921 = 448394^2 + 12411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201211212157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211212197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605606078 + 100605606079.

It is an arithmetic number, because the mean of its divisors is an integer number (100605606079).

Almost surely, 2^201211212157 is an apocalyptic number.

It is an amenable number.

201211212157 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211212157 is an equidigital number, since it uses as much as digits as its factorization.

201211212157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 25.

Adding to 201211212157 its reverse (751212112102), we get a palindrome (952423324259).

The spelling of 201211212157 in words is "two hundred one billion, two hundred eleven million, two hundred twelve thousand, one hundred fifty-seven".