21653022361 has 16 divisors (see below), whose sum is σ = 22120646400. Its totient is φ = 21189024000.

The previous prime is 21653022311. The next prime is 21653022373. The reversal of 21653022361 is 16322035612.

It is a happy number.

It is not a de Polignac number, because 21653022361 - 2⁷ = 21653022233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21653022311) 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, 18028561 + ... + 18029761.

It is an arithmetic number, because the mean of its divisors is an integer number (1382540400).

Almost surely, 2^21653022361 is an apocalyptic number.

It is an amenable number.

21653022361 is a deficient number, since it is larger than the sum of its proper divisors (467624039).

21653022361 is a wasteful number, since it uses less digits than its factorization.

21653022361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400.

The product of its (nonzero) digits is 12960, while the sum is 31.

Adding to 21653022361 its reverse (16322035612), we get a palindrome (37975057973).

The spelling of 21653022361 in words is "twenty-one billion, six hundred fifty-three million, twenty-two thousand, three hundred sixty-one".