221821983475 has 12 divisors (see below), whose sum is σ = 275680174536. Its totient is φ = 177056996480.

The previous prime is 221821983407. The next prime is 221821983517. The reversal of 221821983475 is 574389128122.

It is a de Polignac number, because none of the positive numbers 2^k-221821983475 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10003462 + ... + 10025611.

It is an arithmetic number, because the mean of its divisors is an integer number (22973347878).

Almost surely, 2^221821983475 is an apocalyptic number.

221821983475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221821983475 is a deficient number, since it is larger than the sum of its proper divisors (53858191061).

221821983475 is a wasteful number, since it uses less digits than its factorization.

221821983475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20029526 (or 20029521 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The spelling of 221821983475 in words is "two hundred twenty-one billion, eight hundred twenty-one million, nine hundred eighty-three thousand, four hundred seventy-five".