23011321021 has 16 divisors (see below), whose sum is σ = 26216848000. Its totient is φ = 20022095808.

The previous prime is 23011321019. The next prime is 23011321027. The reversal of 23011321021 is 12012311032.

It is not a de Polignac number, because 23011321021 - 2¹ = 23011321019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23011320986 and 23011321004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23011321027) 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, 184926 + ... + 283231.

It is an arithmetic number, because the mean of its divisors is an integer number (1638553000).

Almost surely, 2^23011321021 is an apocalyptic number.

It is an amenable number.

23011321021 is a deficient number, since it is larger than the sum of its proper divisors (3205526979).

23011321021 is a wasteful number, since it uses less digits than its factorization.

23011321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468388.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 23011321021 its reverse (12012311032), we get a palindrome (35023632053).

The spelling of 23011321021 in words is "twenty-three billion, eleven million, three hundred twenty-one thousand, twenty-one".