21045013252 has 24 divisors (see below), whose sum is σ = 39066529824. Its totient is φ = 9885412992.

The previous prime is 21045013211. The next prime is 21045013279. The reversal of 21045013252 is 25231054012.

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, 245698 + ... + 320089.

It is an arithmetic number, because the mean of its divisors is an integer number (1627772076).

Almost surely, 2^21045013252 is an apocalyptic number.

It is an amenable number.

21045013252 is a deficient number, since it is larger than the sum of its proper divisors (18021516572).

21045013252 is a wasteful number, since it uses less digits than its factorization.

21045013252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566355 (or 566353 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21045013252 its reverse (25231054012), we get a palindrome (46276067264).

The spelling of 21045013252 in words is "twenty-one billion, forty-five million, thirteen thousand, two hundred fifty-two".