221772426673 has 16 divisors (see below), whose sum is σ = 257272516480. Its totient is φ = 187227697536.

The previous prime is 221772426661. The next prime is 221772426679. The reversal of 221772426673 is 376624277122.

It is a cyclic number.

It is not a de Polignac number, because 221772426673 - 2⁵ = 221772426641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221772426679) 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, 3877915 + ... + 3934687.

It is an arithmetic number, because the mean of its divisors is an integer number (16079532280).

Almost surely, 2^221772426673 is an apocalyptic number.

It is an amenable number.

221772426673 is a deficient number, since it is larger than the sum of its proper divisors (35500089807).

221772426673 is an equidigital number, since it uses as much as digits as its factorization.

221772426673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65176.

The product of its digits is 2370816, while the sum is 49.

The spelling of 221772426673 in words is "two hundred twenty-one billion, seven hundred seventy-two million, four hundred twenty-six thousand, six hundred seventy-three".