21555753275 has 48 divisors (see below), whose sum is σ = 31010872320. Its totient is φ = 14558227200.

The previous prime is 21555753269. The next prime is 21555753301. The reversal of 21555753275 is 57235755512.

It is not a de Polignac number, because 21555753275 - 2⁴ = 21555753259 is a prime.

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, 4218272 + ... + 4223378.

It is an arithmetic number, because the mean of its divisors is an integer number (646059840).

Almost surely, 2^21555753275 is an apocalyptic number.

21555753275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21555753275 is a deficient number, since it is larger than the sum of its proper divisors (9455119045).

21555753275 is a wasteful number, since it uses less digits than its factorization.

21555753275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5484 (or 5479 counting only the distinct ones).

The product of its digits is 1837500, while the sum is 47.

The spelling of 21555753275 in words is "twenty-one billion, five hundred fifty-five million, seven hundred fifty-three thousand, two hundred seventy-five".