2021133531 has 16 divisors (see below), whose sum is σ = 2857097600. Its totient is φ = 1267316928.

The previous prime is 2021133529. The next prime is 2021133563. The reversal of 2021133531 is 1353311202.

It is not a de Polignac number, because 2021133531 - 2¹ = 2021133529 is a prime.

It is a super-2 number, since 2×2021133531² = 8169961500265055922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021133498 and 2021133507.

It is not an unprimeable number, because it can be changed into a prime (2021133131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119626 + ... + 135471.

It is an arithmetic number, because the mean of its divisors is an integer number (178568600).

Almost surely, 2^2021133531 is an apocalyptic number.

2021133531 is a deficient number, since it is larger than the sum of its proper divisors (835964069).

2021133531 is a wasteful number, since it uses less digits than its factorization.

2021133531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255258.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 2021133531 is about 44957.0187067603. The cubic root of 2021133531 is about 1264.3432735061.

Adding to 2021133531 its reverse (1353311202), we get a palindrome (3374444733).

The spelling of 2021133531 in words is "two billion, twenty-one million, one hundred thirty-three thousand, five hundred thirty-one".