11512212157 has 16 divisors (see below), whose sum is σ = 12591345600. Its totient is φ = 10483724160.

The previous prime is 11512212091. The next prime is 11512212161. The reversal of 11512212157 is 75121221511.

It is a cyclic number.

It is not a de Polignac number, because 11512212157 - 2⁷ = 11512212029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11512212557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79057 + ... + 171097.

It is an arithmetic number, because the mean of its divisors is an integer number (786959100).

Almost surely, 2^11512212157 is an apocalyptic number.

It is an amenable number.

11512212157 is a deficient number, since it is larger than the sum of its proper divisors (1079133443).

11512212157 is a wasteful number, since it uses less digits than its factorization.

11512212157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92316.

The product of its digits is 1400, while the sum is 28.

Adding to 11512212157 its reverse (75121221511), we get a palindrome (86633433668).

The spelling of 11512212157 in words is "eleven billion, five hundred twelve million, two hundred twelve thousand, one hundred fifty-seven".