21220300331 has 4 divisors (see below), whose sum is σ = 21222128664. Its totient is φ = 21218472000.

The previous prime is 21220300307. The next prime is 21220300357. The reversal of 21220300331 is 13300302212.

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 21220300331 - 2⁶ = 21220300267 is a prime.

It is a super-2 number, since 2×21220300331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220305331) 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, 896645 + ... + 920006.

It is an arithmetic number, because the mean of its divisors is an integer number (5305532166).

Almost surely, 2^21220300331 is an apocalyptic number.

21220300331 is a deficient number, since it is larger than the sum of its proper divisors (1828333).

21220300331 is a wasteful number, since it uses less digits than its factorization.

21220300331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828332.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21220300331 its reverse (13300302212), we get a palindrome (34520602543).

The spelling of 21220300331 in words is "twenty-one billion, two hundred twenty million, three hundred thousand, three hundred thirty-one".