21332240331 has 4 divisors (see below), whose sum is σ = 28442987112. Its totient is φ = 14221493552.

The previous prime is 21332240317. The next prime is 21332240341. The reversal of 21332240331 is 13304223312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21332240331 - 2¹⁰ = 21332239307 is a prime.

It is a super-2 number, since 2×21332240331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21332240341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3555373386 + ... + 3555373391.

It is an arithmetic number, because the mean of its divisors is an integer number (7110746778).

Almost surely, 2^21332240331 is an apocalyptic number.

21332240331 is a deficient number, since it is larger than the sum of its proper divisors (7110746781).

21332240331 is an equidigital number, since it uses as much as digits as its factorization.

21332240331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110746780.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21332240331 its reverse (13304223312), we get a palindrome (34636463643).

The spelling of 21332240331 in words is "twenty-one billion, three hundred thirty-two million, two hundred forty thousand, three hundred thirty-one".