21320222331 has 4 divisors (see below), whose sum is σ = 28426963112. Its totient is φ = 14213481552.

The previous prime is 21320222309. The next prime is 21320222333. The reversal of 21320222331 is 13322202312.

It is a happy number.

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

It is not a de Polignac number, because 21320222331 - 2⁵ = 21320222299 is a prime.

It is a super-2 number, since 2×21320222331² (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 = 21320222298 and 21320222307.

It is not an unprimeable number, because it can be changed into a prime (21320222333) 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, 3553370386 + ... + 3553370391.

It is an arithmetic number, because the mean of its divisors is an integer number (7106740778).

Almost surely, 2^21320222331 is an apocalyptic number.

21320222331 is a deficient number, since it is larger than the sum of its proper divisors (7106740781).

21320222331 is an equidigital number, since it uses as much as digits as its factorization.

21320222331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7106740780.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21320222331 its reverse (13322202312), we get a palindrome (34642424643).

The spelling of 21320222331 in words is "twenty-one billion, three hundred twenty million, two hundred twenty-two thousand, three hundred thirty-one".