21230331001 has 24 divisors (see below), whose sum is σ = 23521385160. Its totient is φ = 19147476480.

The previous prime is 21230330981. The next prime is 21230331019. The reversal of 21230331001 is 10013303212.

It can be written as a sum of positive squares in 4 ways, for example, as 8619265600 + 12611065401 = 92840^2 + 112299^2 .

It is not a de Polignac number, because 21230331001 - 2⁵ = 21230330969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230331041) 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, 8782545 + ... + 8784961.

It is an arithmetic number, because the mean of its divisors is an integer number (980057715).

Almost surely, 2^21230331001 is an apocalyptic number.

It is an amenable number.

21230331001 is a deficient number, since it is larger than the sum of its proper divisors (2291054159).

21230331001 is a wasteful number, since it uses less digits than its factorization.

21230331001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2985 (or 2974 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21230331001 its reverse (10013303212), we get a palindrome (31243634213).

The spelling of 21230331001 in words is "twenty-one billion, two hundred thirty million, three hundred thirty-one thousand, one".