231892021 has 2 divisors, whose sum is σ = 231892022. Its totient is φ = 231892020.

The previous prime is 231891953. The next prime is 231892039. The reversal of 231892021 is 120298132.

231892021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212751396 + 19140625 = 14586^2 + 4375^2 .

It is a cyclic number.

It is not a de Polignac number, because 231892021 - 2¹³ = 231883829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231892051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115946010 + 115946011.

It is an arithmetic number, because the mean of its divisors is an integer number (115946011).

Almost surely, 2^231892021 is an apocalyptic number.

It is an amenable number.

231892021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231892021 is an equidigital number, since it uses as much as digits as its factorization.

231892021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 231892021 is about 15228.0012148673. The cubic root of 231892021 is about 614.3680211200.

The spelling of 231892021 in words is "two hundred thirty-one million, eight hundred ninety-two thousand, twenty-one".