21523118102144 has 32 divisors (see below), whose sum is σ = 42885554456640. Its totient is φ = 10759684826880.

The previous prime is 21523118102117. The next prime is 21523118102197. The reversal of 21523118102144 is 44120181132512.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21523118102144² (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 3 ways as a sum of consecutive naturals, for example, 13904402 + ... + 15374609.

It is an arithmetic number, because the mean of its divisors is an integer number (1340173576770).

Almost surely, 2^{21523118102144} is an apocalyptic number.

It is an amenable number.

21523118102144 is a deficient number, since it is larger than the sum of its proper divisors (21362436354496).

21523118102144 is an equidigital number, since it uses as much as digits as its factorization.

21523118102144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29284768 (or 29284756 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

Adding to 21523118102144 its reverse (44120181132512), we get a palindrome (65643299234656).

The spelling of 21523118102144 in words is "twenty-one trillion, five hundred twenty-three billion, one hundred eighteen million, one hundred two thousand, one hundred forty-four".