221315979067 has 4 divisors (see below), whose sum is σ = 221392218960. Its totient is φ = 221239739176.

The previous prime is 221315979047. The next prime is 221315979097. The reversal of 221315979067 is 760979513122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221315979067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221315979047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38115592 + ... + 38121397.

It is an arithmetic number, because the mean of its divisors is an integer number (55348054740).

Almost surely, 2^221315979067 is an apocalyptic number.

221315979067 is a deficient number, since it is larger than the sum of its proper divisors (76239893).

221315979067 is an equidigital number, since it uses as much as digits as its factorization.

221315979067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76239892.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The spelling of 221315979067 in words is "two hundred twenty-one billion, three hundred fifteen million, nine hundred seventy-nine thousand, sixty-seven".