21535260452 has 24 divisors (see below), whose sum is σ = 39016487160. Its totient is φ = 10388268800.

The previous prime is 21535260443. The next prime is 21535260463. The reversal of 21535260452 is 25406253512.

It can be written as a sum of positive squares in 4 ways, for example, as 505620196 + 21029640256 = 22486^2 + 145016^2 .

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, 79568 + ... + 222264.

It is an arithmetic number, because the mean of its divisors is an integer number (1625686965).

Almost surely, 2^21535260452 is an apocalyptic number.

It is an amenable number.

21535260452 is a deficient number, since it is larger than the sum of its proper divisors (17481226708).

21535260452 is a wasteful number, since it uses less digits than its factorization.

21535260452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144031 (or 144029 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 21535260452 in words is "twenty-one billion, five hundred thirty-five million, two hundred sixty thousand, four hundred fifty-two".