21365255474252 has 96 divisors (see below), whose sum is σ = 40545275258880. Its totient is φ = 9827255370240.

The previous prime is 21365255474093. The next prime is 21365255474267. The reversal of 21365255474252 is 25247455256312.

It is a super-3 number, since 3×21365255474252³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21365255474194 and 21365255474203.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147719723 + ... + 147864285.

It is an arithmetic number, because the mean of its divisors is an integer number (422346617280).

Almost surely, 2^{21365255474252} is an apocalyptic number.

It is an amenable number.

21365255474252 is a deficient number, since it is larger than the sum of its proper divisors (19180019784628).

21365255474252 is a wasteful number, since it uses less digits than its factorization.

21365255474252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145263 (or 145261 counting only the distinct ones).

The product of its digits is 20160000, while the sum is 53.

The spelling of 21365255474252 in words is "twenty-one trillion, three hundred sixty-five billion, two hundred fifty-five million, four hundred seventy-four thousand, two hundred fifty-two".