234256021 has 2 divisors, whose sum is σ = 234256022. Its totient is φ = 234256020.

The previous prime is 234256007. The next prime is 234256027. The reversal of 234256021 is 120652432.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234243025 + 12996 = 15305^2 + 114^2 .

It is a cyclic number.

It is not a de Polignac number, because 234256021 - 2¹⁷ = 234124949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (234256027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117128010 + 117128011.

It is an arithmetic number, because the mean of its divisors is an integer number (117128011).

Almost surely, 2^234256021 is an apocalyptic number.

It is an amenable number.

234256021 is a deficient number, since it is larger than the sum of its proper divisors (1).

234256021 is an equidigital number, since it uses as much as digits as its factorization.

234256021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 234256021 is about 15305.4245612463. The cubic root of 234256021 is about 616.4486711648.

The spelling of 234256021 in words is "two hundred thirty-four million, two hundred fifty-six thousand, twenty-one".