221579079642 has 12 divisors (see below), whose sum is σ = 480088005930. Its totient is φ = 73859693208.

The previous prime is 221579079611. The next prime is 221579079671. The reversal of 221579079642 is 246970975122.

221579079642 is a `hidden beast` number, since 2 + 2 + 1 + 579 + 0 + 7 + 9 + 64 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 181662635961 + 39916443681 = 426219^2 + 199791^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6154974417 + ... + 6154974452.

Almost surely, 2^221579079642 is an apocalyptic number.

221579079642 is an abundant number, since it is smaller than the sum of its proper divisors (258508926288).

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

221579079642 is a wasteful number, since it uses less digits than its factorization.

221579079642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12309948877 (or 12309948874 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 221579079642 in words is "two hundred twenty-one billion, five hundred seventy-nine million, seventy-nine thousand, six hundred forty-two".