221979599967 has 16 divisors (see below), whose sum is σ = 311284850688. Its totient is φ = 140510516640.

The previous prime is 221979599957. The next prime is 221979599971. The reversal of 221979599967 is 769995979122.

It is not a de Polignac number, because 221979599967 - 2⁷ = 221979599839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221979599957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22512783 + ... + 22522640.

It is an arithmetic number, because the mean of its divisors is an integer number (19455303168).

Almost surely, 2^221979599967 is an apocalyptic number.

221979599967 is a deficient number, since it is larger than the sum of its proper divisors (89305250721).

221979599967 is a wasteful number, since it uses less digits than its factorization.

221979599967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45035510.

The product of its digits is 347208120, while the sum is 75.

The spelling of 221979599967 in words is "two hundred twenty-one billion, nine hundred seventy-nine million, five hundred ninety-nine thousand, nine hundred sixty-seven".