216157514621 has 2 divisors, whose sum is σ = 216157514622. Its totient is φ = 216157514620.

The previous prime is 216157514611. The next prime is 216157514647. The reversal of 216157514621 is 126415751612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126643456900 + 89514057721 = 355870^2 + 299189^2 .

It is a cyclic number.

It is not a de Polignac number, because 216157514621 - 2⁶ = 216157514557 is a prime.

It is a super-2 number, since 2×216157514621² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216157514611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108078757310 + 108078757311.

It is an arithmetic number, because the mean of its divisors is an integer number (108078757311).

Almost surely, 2^216157514621 is an apocalyptic number.

It is an amenable number.

216157514621 is a deficient number, since it is larger than the sum of its proper divisors (1).

216157514621 is an equidigital number, since it uses as much as digits as its factorization.

216157514621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The spelling of 216157514621 in words is "two hundred sixteen billion, one hundred fifty-seven million, five hundred fourteen thousand, six hundred twenty-one".