23331021 has 16 divisors (see below), whose sum is σ = 37643904. Its totient is φ = 12547584.

The previous prime is 23331017. The next prime is 23331023. The reversal of 23331021 is 12013332.

It is not a de Polignac number, because 23331021 - 2² = 23331017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23331023) 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, 32320 + ... + 33033.

It is an arithmetic number, because the mean of its divisors is an integer number (2352744).

Almost surely, 2^23331021 is an apocalyptic number.

23331021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23331021 is a deficient number, since it is larger than the sum of its proper divisors (14312883).

23331021 is a wasteful number, since it uses less digits than its factorization.

23331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65380.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 23331021 is about 4830.2195602271. The cubic root of 23331021 is about 285.7445230260.

Adding to 23331021 its reverse (12013332), we get a palindrome (35344353).

The spelling of 23331021 in words is "twenty-three million, three hundred thirty-one thousand, twenty-one".