238866021 has 12 divisors (see below), whose sum is σ = 345284160. Its totient is φ = 159126120.

The previous prime is 238865999. The next prime is 238866029. The reversal of 238866021 is 120668832.

It is not a de Polignac number, because 238866021 - 2¹⁵ = 238833253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238866029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4036 + ... + 22226.

It is an arithmetic number, because the mean of its divisors is an integer number (28773680).

Almost surely, 2^238866021 is an apocalyptic number.

It is an amenable number.

238866021 is a deficient number, since it is larger than the sum of its proper divisors (106418139).

238866021 is a wasteful number, since it uses less digits than its factorization.

238866021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19656 (or 19653 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 238866021 is about 15455.2910357586. The cubic root of 238866021 is about 620.4661954991.

The spelling of 238866021 in words is "two hundred thirty-eight million, eight hundred sixty-six thousand, twenty-one".