201210721157 has 2 divisors, whose sum is σ = 201210721158. Its totient is φ = 201210721156.

The previous prime is 201210721133. The next prime is 201210721169. The reversal of 201210721157 is 751127012102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168584969281 + 32625751876 = 410591^2 + 180626^2 .

It is a cyclic number.

It is not a de Polignac number, because 201210721157 - 2¹⁶ = 201210655621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201210721357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605360578 + 100605360579.

It is an arithmetic number, because the mean of its divisors is an integer number (100605360579).

Almost surely, 2^201210721157 is an apocalyptic number.

It is an amenable number.

201210721157 is a deficient number, since it is larger than the sum of its proper divisors (1).

201210721157 is an equidigital number, since it uses as much as digits as its factorization.

201210721157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960, while the sum is 29.

Adding to 201210721157 its reverse (751127012102), we get a palindrome (952337733259).

The spelling of 201210721157 in words is "two hundred one billion, two hundred ten million, seven hundred twenty-one thousand, one hundred fifty-seven".