21322400561231 has 16 divisors (see below), whose sum is σ = 28147523431680. Its totient is φ = 15637513015680.

The previous prime is 21322400561227. The next prime is 21322400561269. The reversal of 21322400561231 is 13216500422312.

It is a cyclic number.

It is not a de Polignac number, because 21322400561231 - 2² = 21322400561227 is a prime.

It is a super-2 number, since 2×21322400561231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322400561221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8144536721 + ... + 8144539338.

It is an arithmetic number, because the mean of its divisors is an integer number (1759220214480).

Almost surely, 2^{21322400561231} is an apocalyptic number.

21322400561231 is a deficient number, since it is larger than the sum of its proper divisors (6825122870449).

21322400561231 is a wasteful number, since it uses less digits than its factorization.

21322400561231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16289076094.

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 21322400561231 its reverse (13216500422312), we get a palindrome (34538900983543).

The spelling of 21322400561231 in words is "twenty-one trillion, three hundred twenty-two billion, four hundred million, five hundred sixty-one thousand, two hundred thirty-one".