221199999938 has 16 divisors (see below), whose sum is σ = 332447036184. Its totient is φ = 110384440320.

The previous prime is 221199999893. The next prime is 221199999971. The reversal of 221199999938 is 839999991122.

It can be written as a sum of positive squares in 4 ways, for example, as 219208430809 + 1991569129 = 468197^2 + 44627^2 .

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, 3941918 + ... + 3997638.

Almost surely, 2^221199999938 is an apocalyptic number.

221199999938 is a deficient number, since it is larger than the sum of its proper divisors (111247036246).

221199999938 is a wasteful number, since it uses less digits than its factorization.

221199999938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59557.

The product of its digits is 51018336, while the sum is 71.

The spelling of 221199999938 in words is "two hundred twenty-one billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred thirty-eight".