21220202331 has 12 divisors (see below), whose sum is σ = 30785255280. Its totient is φ = 14085023760.

The previous prime is 21220202329. The next prime is 21220202359. The reversal of 21220202331 is 13320202212.

It is not a de Polignac number, because 21220202331 - 2¹ = 21220202329 is a prime.

It is a super-2 number, since 2×21220202331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21220202131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5145975 + ... + 5150096.

It is an arithmetic number, because the mean of its divisors is an integer number (2565437940).

Almost surely, 2^21220202331 is an apocalyptic number.

21220202331 is a deficient number, since it is larger than the sum of its proper divisors (9565052949).

21220202331 is a wasteful number, since it uses less digits than its factorization.

21220202331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10296306 (or 10296303 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21220202331 its reverse (13320202212), we get a palindrome (34540404543).

The spelling of 21220202331 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, three hundred thirty-one".