2021154531 has 32 divisors (see below), whose sum is σ = 3143702016. Its totient is φ = 1141440000.

The previous prime is 2021154529. The next prime is 2021154547. The reversal of 2021154531 is 1354511202.

It is a happy number.

It is not a de Polignac number, because 2021154531 - 2¹ = 2021154529 is a prime.

It is a super-2 number, since 2×2021154531² = 8170131276363659922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2021154521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38826 + ... + 74496.

It is an arithmetic number, because the mean of its divisors is an integer number (98240688).

Almost surely, 2^2021154531 is an apocalyptic number.

2021154531 is a deficient number, since it is larger than the sum of its proper divisors (1122547485).

2021154531 is a wasteful number, since it uses less digits than its factorization.

2021154531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35803.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2021154531 is about 44957.2522625660. The cubic root of 2021154531 is about 1264.3476524213.

Adding to 2021154531 its reverse (1354511202), we get a palindrome (3375665733).

The spelling of 2021154531 in words is "two billion, twenty-one million, one hundred fifty-four thousand, five hundred thirty-one".