2021123231 has 2 divisors, whose sum is σ = 2021123232. Its totient is φ = 2021123230.

The previous prime is 2021123207. The next prime is 2021123239. The reversal of 2021123231 is 1323211202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021123231 - 2¹⁴ = 2021106847 is a prime.

It is a super-2 number, since 2×2021123231² = 8169878229775758722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021123239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010561615 + 1010561616.

It is an arithmetic number, because the mean of its divisors is an integer number (1010561616).

Almost surely, 2^2021123231 is an apocalyptic number.

2021123231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021123231 is an equidigital number, since it uses as much as digits as its factorization.

2021123231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2021123231 is about 44956.9041527550. The cubic root of 2021123231 is about 1264.3411257414.

Adding to 2021123231 its reverse (1323211202), we get a palindrome (3344334433).

The spelling of 2021123231 in words is "two billion, twenty-one million, one hundred twenty-three thousand, two hundred thirty-one".