215438157121 has 8 divisors (see below), whose sum is σ = 235332288288. Its totient is φ = 195595500000.

The previous prime is 215438157059. The next prime is 215438157169. The reversal of 215438157121 is 121751834512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215438157121 - 2¹³ = 215438148929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215438158121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12859755 + ... + 12876496.

It is an arithmetic number, because the mean of its divisors is an integer number (29416536036).

Almost surely, 2^215438157121 is an apocalyptic number.

It is an amenable number.

215438157121 is a deficient number, since it is larger than the sum of its proper divisors (19894131167).

215438157121 is a wasteful number, since it uses less digits than its factorization.

215438157121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25737023.

The product of its digits is 67200, while the sum is 40.

The spelling of 215438157121 in words is "two hundred fifteen billion, four hundred thirty-eight million, one hundred fifty-seven thousand, one hundred twenty-one".