21313220331 has 64 divisors (see below), whose sum is σ = 33275805696. Its totient is φ = 12015052800.

The previous prime is 21313220323. The next prime is 21313220333. The reversal of 21313220331 is 13302231312.

It is not a de Polignac number, because 21313220331 - 2³ = 21313220323 is a prime.

It is a super-2 number, since 2×21313220331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21313220298 and 21313220307.

It is not an unprimeable number, because it can be changed into a prime (21313220333) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5949961 + ... + 5953541.

It is an arithmetic number, because the mean of its divisors is an integer number (519934464).

Almost surely, 2^21313220331 is an apocalyptic number.

21313220331 is a deficient number, since it is larger than the sum of its proper divisors (11962585365).

21313220331 is a wasteful number, since it uses less digits than its factorization.

21313220331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852.

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

Adding to 21313220331 its reverse (13302231312), we get a palindrome (34615451643).

The spelling of 21313220331 in words is "twenty-one billion, three hundred thirteen million, two hundred twenty thousand, three hundred thirty-one".