2331252021 has 16 divisors (see below), whose sum is σ = 3556726784. Its totient is φ = 1330515504.

The previous prime is 2331252017. The next prime is 2331252047. The reversal of 2331252021 is 1202521332.

It is not a de Polignac number, because 2331252021 - 2² = 2331252017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2331252071) 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, 50161 + ... + 84726.

It is an arithmetic number, because the mean of its divisors is an integer number (222295424).

Almost surely, 2^2331252021 is an apocalyptic number.

2331252021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2331252021 is a deficient number, since it is larger than the sum of its proper divisors (1225474763).

2331252021 is a wasteful number, since it uses less digits than its factorization.

2331252021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135720.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2331252021 is about 48283.0407182481. The cubic root of 2331252021 is about 1325.9579205154.

Adding to 2331252021 its reverse (1202521332), we get a palindrome (3533773353).

The spelling of 2331252021 in words is "two billion, three hundred thirty-one million, two hundred fifty-two thousand, twenty-one".