21202201331 has 4 divisors (see below), whose sum is σ = 21549778464. Its totient is φ = 20854624200.

The previous prime is 21202201313. The next prime is 21202201337. The reversal of 21202201331 is 13310220212.

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 21202201331 - 2¹⁰ = 21202200307 is a prime.

It is a super-2 number, since 2×21202201331² (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 (21202201337) 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, 173788475 + ... + 173788596.

It is an arithmetic number, because the mean of its divisors is an integer number (5387444616).

Almost surely, 2^21202201331 is an apocalyptic number.

21202201331 is a deficient number, since it is larger than the sum of its proper divisors (347577133).

21202201331 is an equidigital number, since it uses as much as digits as its factorization.

21202201331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347577132.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21202201331 its reverse (13310220212), we get a palindrome (34512421543).

The spelling of 21202201331 in words is "twenty-one billion, two hundred two million, two hundred one thousand, three hundred thirty-one".