121527615213 has 6 divisors (see below), whose sum is σ = 175539888654. Its totient is φ = 81018410136.

The previous prime is 121527615193. The next prime is 121527615229. The reversal of 121527615213 is 312516725121.

121527615213 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 27 + 615 + 2 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 120282725124 + 1244890089 = 346818^2 + 35283^2 .

It is not a de Polignac number, because 121527615213 - 2¹³ = 121527607021 is a prime.

It is a super-2 number, since 2×121527615213² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121527615613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6751534170 + ... + 6751534187.

It is an arithmetic number, because the mean of its divisors is an integer number (29256648109).

Almost surely, 2^121527615213 is an apocalyptic number.

It is an amenable number.

121527615213 is a deficient number, since it is larger than the sum of its proper divisors (54012273441).

121527615213 is a wasteful number, since it uses less digits than its factorization.

121527615213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13503068363 (or 13503068360 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The spelling of 121527615213 in words is "one hundred twenty-one billion, five hundred twenty-seven million, six hundred fifteen thousand, two hundred thirteen".