21653037453444 has 24 divisors (see below), whose sum is σ = 50524049465568. Its totient is φ = 7217636950080.

The previous prime is 21653037453373. The next prime is 21653037453457. The reversal of 21653037453444 is 44435473035612.

It is a super-2 number, since 2×21653037453444² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3101422 + ... + 7274949.

It is an arithmetic number, because the mean of its divisors is an integer number (2105168727732).

Almost surely, 2^{21653037453444} is an apocalyptic number.

It is an amenable number.

21653037453444 is an abundant number, since it is smaller than the sum of its proper divisors (28871012012124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21653037453444 is a wasteful number, since it uses less digits than its factorization.

21653037453444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10550275 (or 10550273 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 51.

The spelling of 21653037453444 in words is "twenty-one trillion, six hundred fifty-three billion, thirty-seven million, four hundred fifty-three thousand, four hundred forty-four".