25530452111021 has 16 divisors (see below), whose sum is σ = 29994013421568. Its totient is φ = 21424015934400.

The previous prime is 25530452111011. The next prime is 25530452111041. The reversal of 25530452111021 is 12011125403552.

It is a cyclic number.

It is not a de Polignac number, because 25530452111021 - 2⁶ = 25530452110957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25530452111011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25500116 + ... + 26482386.

It is an arithmetic number, because the mean of its divisors is an integer number (1874625838848).

Almost surely, 2^{25530452111021} is an apocalyptic number.

It is an amenable number.

25530452111021 is a deficient number, since it is larger than the sum of its proper divisors (4463561310547).

25530452111021 is a wasteful number, since it uses less digits than its factorization.

25530452111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164052.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 25530452111021 its reverse (12011125403552), we get a palindrome (37541577514573).

It can be divided in two parts, 255304 and 52111021, that added together give a palindrome (52366325).

The spelling of 25530452111021 in words is "twenty-five trillion, five hundred thirty billion, four hundred fifty-two million, one hundred eleven thousand, twenty-one".