21455142442425 has 48 divisors (see below), whose sum is σ = 40081923432000. Its totient is φ = 11248797824640.

The previous prime is 21455142442387. The next prime is 21455142442463. The reversal of 21455142442425 is 52424424155412.

21455142442425 is a `hidden beast` number, since 2 + 1 + 45 + 5 + 142 + 4 + 42 + 425 = 666.

It is an interprime number because it is at equal distance from previous prime (21455142442387) and next prime (21455142442463).

It is not a de Polignac number, because 21455142442425 - 2⁷ = 21455142442297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 269327940 + ... + 269407589.

It is an arithmetic number, because the mean of its divisors is an integer number (835040071500).

Almost surely, 2^{21455142442425} is an apocalyptic number.

21455142442425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21455142442425 is a deficient number, since it is larger than the sum of its proper divisors (18626780989575).

21455142442425 is a wasteful number, since it uses less digits than its factorization.

21455142442425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538735607 (or 538735596 counting only the distinct ones).

The product of its digits is 2048000, while the sum is 45.

Adding to 21455142442425 its reverse (52424424155412), we get a palindrome (73879566597837).

The spelling of 21455142442425 in words is "twenty-one trillion, four hundred fifty-five billion, one hundred forty-two million, four hundred forty-two thousand, four hundred twenty-five".