23132121021 has 20 divisors (see below), whose sum is σ = 34689878652. Its totient is φ = 15361394688.

The previous prime is 23132120953. The next prime is 23132121073. The reversal of 23132121021 is 12012123132.

It can be written as a sum of positive squares in 2 ways, for example, as 17910468900 + 5221652121 = 133830^2 + 72261^2 .

It is not a de Polignac number, because 23132121021 - 2⁹ = 23132120509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23132120985 and 23132121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23132121721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 534790 + ... + 576423.

Almost surely, 2^23132121021 is an apocalyptic number.

It is an amenable number.

23132121021 is a deficient number, since it is larger than the sum of its proper divisors (11557757631).

23132121021 is a wasteful number, since it uses less digits than its factorization.

23132121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111482 (or 1111473 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 23132121021 its reverse (12012123132), we get a palindrome (35144244153).

The spelling of 23132121021 in words is "twenty-three billion, one hundred thirty-two million, one hundred twenty-one thousand, twenty-one".