221323209975 has 96 divisors (see below), whose sum is σ = 465002301440. Its totient is φ = 101102152320.

The previous prime is 221323209953. The next prime is 221323210021. The reversal of 221323209975 is 579902323122.

221323209975 is a `hidden beast` number, since 221 + 32 + 320 + 9 + 9 + 75 = 666.

It is not a de Polignac number, because 221323209975 - 2⁸ = 221323209719 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 221323209975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6707217 + ... + 6740133.

Almost surely, 2^221323209975 is an apocalyptic number.

221323209975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221323209975 is an abundant number, since it is smaller than the sum of its proper divisors (243679091465).

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

221323209975 is a wasteful number, since it uses less digits than its factorization.

221323209975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34366 (or 34355 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 221323209975 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred nine thousand, nine hundred seventy-five".