238437937921 has 4 divisors (see below), whose sum is σ = 238458348100. Its totient is φ = 238417527744.

The previous prime is 238437937847. The next prime is 238437937939. The reversal of 238437937921 is 129739734832.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116888088321 + 121549849600 = 341889^2 + 348640^2 .

It is a cyclic number.

It is not a de Polignac number, because 238437937921 - 2¹³ = 238437929729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238437937951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10187556 + ... + 10210933.

It is an arithmetic number, because the mean of its divisors is an integer number (59614587025).

Almost surely, 2^238437937921 is an apocalyptic number.

It is an amenable number.

238437937921 is a deficient number, since it is larger than the sum of its proper divisors (20410179).

238437937921 is a wasteful number, since it uses less digits than its factorization.

238437937921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20410178.

The product of its digits is 13716864, while the sum is 58.

The spelling of 238437937921 in words is "two hundred thirty-eight billion, four hundred thirty-seven million, nine hundred thirty-seven thousand, nine hundred twenty-one".