2021125531 has 2 divisors, whose sum is σ = 2021125532. Its totient is φ = 2021125530.

The previous prime is 2021125501. The next prime is 2021125541. The reversal of 2021125531 is 1355211202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2021125531 - 2⁵ = 2021125499 is a prime.

It is a super-2 number, since 2×2021125531² = 8169896824120063922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2021125501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010562765 + 1010562766.

It is an arithmetic number, because the mean of its divisors is an integer number (1010562766).

Almost surely, 2^2021125531 is an apocalyptic number.

2021125531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021125531 is an equidigital number, since it uses as much as digits as its factorization.

2021125531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 2021125531 is about 44956.9297328009. The cubic root of 2021125531 is about 1264.3416053400.

Adding to 2021125531 its reverse (1355211202), we get a palindrome (3376336733).

The spelling of 2021125531 in words is "two billion, twenty-one million, one hundred twenty-five thousand, five hundred thirty-one".