21205530675 has 120 divisors (see below), whose sum is σ = 44965907712. Its totient is φ = 9677880000.

The previous prime is 21205530653. The next prime is 21205530719. The reversal of 21205530675 is 57603550212.

21205530675 is a `hidden beast` number, since 21 + 20 + 553 + 0 + 67 + 5 = 666.

It is not a de Polignac number, because 21205530675 - 2⁹ = 21205530163 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 14613700 + ... + 14615150.

Almost surely, 2^21205530675 is an apocalyptic number.

21205530675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21205530675 is an abundant number, since it is smaller than the sum of its proper divisors (23760377037).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21205530675 is a wasteful number, since it uses less digits than its factorization.

21205530675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511 (or 2497 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The spelling of 21205530675 in words is "twenty-one billion, two hundred five million, five hundred thirty thousand, six hundred seventy-five".