238905392121 has 24 divisors (see below), whose sum is σ = 378019081440. Its totient is φ = 144190339200.

The previous prime is 238905392113. The next prime is 238905392153. The reversal of 238905392121 is 121293509832.

238905392121 is a `hidden beast` number, since 2 + 3 + 8 + 90 + 539 + 2 + 1 + 21 = 666.

It is not a de Polignac number, because 238905392121 - 2³ = 238905392113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (238905392221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4982751 + ... + 5030468.

It is an arithmetic number, because the mean of its divisors is an integer number (15750795060).

Almost surely, 2^238905392121 is an apocalyptic number.

It is an amenable number.

238905392121 is a deficient number, since it is larger than the sum of its proper divisors (139113689319).

238905392121 is a wasteful number, since it uses less digits than its factorization.

238905392121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10013477 (or 10013474 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 238905392121 in words is "two hundred thirty-eight billion, nine hundred five million, three hundred ninety-two thousand, one hundred twenty-one".