21455123580375 has 64 divisors (see below), whose sum is σ = 36671736216960. Its totient is φ = 11131796505600.

The previous prime is 21455123580347. The next prime is 21455123580377. The reversal of 21455123580375 is 57308532155412.

It is not a de Polignac number, because 21455123580375 - 2⁶ = 21455123580311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455123580377) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95028121 + ... + 95253629.

It is an arithmetic number, because the mean of its divisors is an integer number (572995878390).

Almost surely, 2^{21455123580375} is an apocalyptic number.

21455123580375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21455123580375 is a deficient number, since it is larger than the sum of its proper divisors (15216612636585).

21455123580375 is a wasteful number, since it uses less digits than its factorization.

21455123580375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232421 (or 232411 counting only the distinct ones).

The product of its (nonzero) digits is 5040000, while the sum is 51.

The spelling of 21455123580375 in words is "twenty-one trillion, four hundred fifty-five billion, one hundred twenty-three million, five hundred eighty thousand, three hundred seventy-five".