23215411021 has 24 divisors (see below), whose sum is σ = 27034915320. Its totient is φ = 19851617280.

The previous prime is 23215411007. The next prime is 23215411039. The reversal of 23215411021 is 12011451232.

It can be written as a sum of positive squares in 4 ways, for example, as 13416588900 + 9798822121 = 115830^2 + 98989^2 .

It is not a de Polignac number, because 23215411021 - 2¹⁷ = 23215279949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23215410983 and 23215411001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23215411081) 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, 6599155 + ... + 6602671.

It is an arithmetic number, because the mean of its divisors is an integer number (1126454805).

Almost surely, 2^23215411021 is an apocalyptic number.

It is an amenable number.

23215411021 is a deficient number, since it is larger than the sum of its proper divisors (3819504299).

23215411021 is a wasteful number, since it uses less digits than its factorization.

23215411021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6765 (or 6754 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 23215411021 its reverse (12011451232), we get a palindrome (35226862253).

The spelling of 23215411021 in words is "twenty-three billion, two hundred fifteen million, four hundred eleven thousand, twenty-one".