21455002522425 has 48 divisors (see below), whose sum is σ = 37341188314560. Its totient is φ = 10839854499840.

The previous prime is 21455002522357. The next prime is 21455002522427. The reversal of 21455002522425 is 52422520055412.

It is not a de Polignac number, because 21455002522425 - 2⁸ = 21455002522169 is a prime.

It is a super-2 number, since 2×21455002522425² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21455002522427) 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 47 ways as a sum of consecutive naturals, for example, 27512689 + ... + 28281761.

It is an arithmetic number, because the mean of its divisors is an integer number (777941423220).

Almost surely, 2^{21455002522425} is an apocalyptic number.

21455002522425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21455002522425 is a deficient number, since it is larger than the sum of its proper divisors (15886185792135).

21455002522425 is a wasteful number, since it uses less digits than its factorization.

21455002522425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788682 (or 788677 counting only the distinct ones).

The product of its (nonzero) digits is 320000, while the sum is 39.

Adding to 21455002522425 its reverse (52422520055412), we get a palindrome (73877522577837).

The spelling of 21455002522425 in words is "twenty-one trillion, four hundred fifty-five billion, two million, five hundred twenty-two thousand, four hundred twenty-five".