221221099974 has 24 divisors (see below), whose sum is σ = 514677661848. Its totient is φ = 63206028480.

The previous prime is 221221099963. The next prime is 221221100033. The reversal of 221221099974 is 479990122122.

It is a happy number.

It is a Curzon number.

It is a congruent 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, 376226067 + ... + 376226654.

It is an arithmetic number, because the mean of its divisors is an integer number (21444902577).

Almost surely, 2^221221099974 is an apocalyptic number.

221221099974 is an abundant number, since it is smaller than the sum of its proper divisors (293456561874).

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

221221099974 is a wasteful number, since it uses less digits than its factorization.

221221099974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752452740 (or 752452733 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The spelling of 221221099974 in words is "two hundred twenty-one billion, two hundred twenty-one million, ninety-nine thousand, nine hundred seventy-four".