21323221331 has 16 divisors (see below), whose sum is σ = 21787833600. Its totient is φ = 20863768800.

The previous prime is 21323221321. The next prime is 21323221349. The reversal of 21323221331 is 13312232312.

It is a cyclic number.

It is not a de Polignac number, because 21323221331 - 2²⁶ = 21256112467 is a prime.

It is a super-2 number, since 2×21323221331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323221297 and 21323221306.

It is not an unprimeable number, because it can be changed into a prime (21323221301) 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, 5825780 + ... + 5829438.

It is an arithmetic number, because the mean of its divisors is an integer number (1361739600).

Almost surely, 2^21323221331 is an apocalyptic number.

21323221331 is a deficient number, since it is larger than the sum of its proper divisors (464612269).

21323221331 is a wasteful number, since it uses less digits than its factorization.

21323221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4330.

The product of its digits is 1296, while the sum is 23.

Adding to 21323221331 its reverse (13312232312), we get a palindrome (34635453643).

The spelling of 21323221331 in words is "twenty-one billion, three hundred twenty-three million, two hundred twenty-one thousand, three hundred thirty-one".