21455032013253 has 6 divisors (see below), whose sum is σ = 30990601796934. Its totient is φ = 14303354675496.

The previous prime is 21455032013209. The next prime is 21455032013257. The reversal of 21455032013253 is 35231023055412.

21455032013253 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 5 + 0 + 320 + 1 + 325 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18040049980164 + 3414982033089 = 4247358^2 + 1847967^2 .

It is not a de Polignac number, because 21455032013253 - 2¹³ = 21455032005061 is a prime.

It is a super-2 number, since 2×21455032013253² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1191946222950 + ... + 1191946222967.

It is an arithmetic number, because the mean of its divisors is an integer number (5165100299489).

Almost surely, 2^{21455032013253} is an apocalyptic number.

It is an amenable number.

21455032013253 is a deficient number, since it is larger than the sum of its proper divisors (9535569783681).

21455032013253 is a wasteful number, since it uses less digits than its factorization.

21455032013253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383892445923 (or 2383892445920 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 21455032013253 its reverse (35231023055412), we get a palindrome (56686055068665).

The spelling of 21455032013253 in words is "twenty-one trillion, four hundred fifty-five billion, thirty-two million, thirteen thousand, two hundred fifty-three".