221681286192 has 40 divisors (see below), whose sum is σ = 591150100480. Its totient is φ = 71510091840.

The previous prime is 221681286187. The next prime is 221681286247. The reversal of 221681286192 is 291682186122.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74488192 + ... + 74491167.

It is an arithmetic number, because the mean of its divisors is an integer number (14778752512).

Almost surely, 2^221681286192 is an apocalyptic number.

It is an amenable number.

221681286192 is an abundant number, since it is smaller than the sum of its proper divisors (369468814288).

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

221681286192 is a wasteful number, since it uses less digits than its factorization.

221681286192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148979401 (or 148979395 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The spelling of 221681286192 in words is "two hundred twenty-one billion, six hundred eighty-one million, two hundred eighty-six thousand, one hundred ninety-two".