21455113530425 has 24 divisors (see below), whose sum is σ = 27045934425600. Its totient is φ = 16880882503680.

The previous prime is 21455113530407. The next prime is 21455113530437. The reversal of 21455113530425 is 52403531155412.

It is a de Polignac number, because none of the positive numbers 2^k-21455113530425 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20627345 + ... + 21642494.

It is an arithmetic number, because the mean of its divisors is an integer number (1126913934400).

Almost surely, 2^{21455113530425} is an apocalyptic number.

21455113530425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21455113530425 is a deficient number, since it is larger than the sum of its proper divisors (5590820895175).

21455113530425 is a wasteful number, since it uses less digits than its factorization.

21455113530425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42270185 (or 42270180 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 41.

Adding to 21455113530425 its reverse (52403531155412), we get a palindrome (73858644685837).

The spelling of 21455113530425 in words is "twenty-one trillion, four hundred fifty-five billion, one hundred thirteen million, five hundred thirty thousand, four hundred twenty-five".