21552521251142 has 96 divisors (see below), whose sum is σ = 39333298540032. Its totient is φ = 8659572375168.

The previous prime is 21552521251127. The next prime is 21552521251213. The reversal of 21552521251142 is 24115212525512.

It is a super-2 number, since 2×21552521251142² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21552521251096 and 21552521251105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 275276333 + ... + 275354615.

It is an arithmetic number, because the mean of its divisors is an integer number (409721859792).

Almost surely, 2^{21552521251142} is an apocalyptic number.

21552521251142 is a deficient number, since it is larger than the sum of its proper divisors (17780777288890).

21552521251142 is a wasteful number, since it uses less digits than its factorization.

21552521251142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78610 (or 78531 counting only the distinct ones).

The product of its digits is 80000, while the sum is 38.

Adding to 21552521251142 its reverse (24115212525512), we get a palindrome (45667733776654).

The spelling of 21552521251142 in words is "twenty-one trillion, five hundred fifty-two billion, five hundred twenty-one million, two hundred fifty-one thousand, one hundred forty-two".