21024514250425 has 24 divisors (see below), whose sum is σ = 29799789048576. Its totient is φ = 14414366778240.

The previous prime is 21024514250393. The next prime is 21024514250479. The reversal of 21024514250425 is 52405241542012.

It is not a de Polignac number, because 21024514250425 - 2⁵ = 21024514250393 is a prime.

It is a super-2 number, since 2×21024514250425² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9143164 + ... + 11209213.

It is an arithmetic number, because the mean of its divisors is an integer number (1241657877024).

Almost surely, 2^{21024514250425} is an apocalyptic number.

21024514250425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21024514250425 is a deficient number, since it is larger than the sum of its proper divisors (8775274798151).

21024514250425 is a wasteful number, since it uses less digits than its factorization.

21024514250425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20358297 (or 20358292 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 21024514250425 its reverse (52405241542012), we get a palindrome (73429755792437).

The spelling of 21024514250425 in words is "twenty-one trillion, twenty-four billion, five hundred fourteen million, two hundred fifty thousand, four hundred twenty-five".