21455032013252 has 12 divisors (see below), whose sum is σ = 37546608851136. Its totient is φ = 10727429484360.

The previous prime is 21455032013209. The next prime is 21455032013257. The reversal of 21455032013252 is 25231023055412.

It is not an unprimeable number, because it can be changed into a prime (21455032013257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21071024 + ... + 22065767.

It is an arithmetic number, because the mean of its divisors is an integer number (3128884070928).

Almost surely, 2^{21455032013252} is an apocalyptic number.

It is an amenable number.

21455032013252 is a deficient number, since it is larger than the sum of its proper divisors (16091576837884).

21455032013252 is a wasteful number, since it uses less digits than its factorization.

21455032013252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43261138 (or 43261136 counting only the distinct ones).

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

Adding to 21455032013252 its reverse (25231023055412), we get a palindrome (46686055068664).

The spelling of 21455032013252 in words is "twenty-one trillion, four hundred fifty-five billion, thirty-two million, thirteen thousand, two hundred fifty-two".