23121332031 has 24 divisors (see below), whose sum is σ = 36315621120. Its totient is φ = 13044940272.

The previous prime is 23121332029. The next prime is 23121332033. The reversal of 23121332031 is 13023312132.

It is an interprime number because it is at equal distance from previous prime (23121332029) and next prime (23121332033).

It is not a de Polignac number, because 23121332031 - 2¹ = 23121332029 is a prime.

It is a super-2 number, since 2×23121332031² (a number of 22 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 23121331989 and 23121332007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121332033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 983881 + ... + 1007106.

It is an arithmetic number, because the mean of its divisors is an integer number (1513150880).

Almost surely, 2^23121332031 is an apocalyptic number.

23121332031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23121332031 is a deficient number, since it is larger than the sum of its proper divisors (13194289089).

23121332031 is a wasteful number, since it uses less digits than its factorization.

23121332031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991083 (or 1991076 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 23121332031 its reverse (13023312132), we get a palindrome (36144644163).

The spelling of 23121332031 in words is "twenty-three billion, one hundred twenty-one million, three hundred thirty-two thousand, thirty-one".