221085295679 has 2 divisors, whose sum is σ = 221085295680. Its totient is φ = 221085295678.

The previous prime is 221085295621. The next prime is 221085295687. The reversal of 221085295679 is 976592580122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221085295679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221085295609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110542647839 + 110542647840.

It is an arithmetic number, because the mean of its divisors is an integer number (110542647840).

Almost surely, 2^221085295679 is an apocalyptic number.

221085295679 is a deficient number, since it is larger than the sum of its proper divisors (1).

221085295679 is an equidigital number, since it uses as much as digits as its factorization.

221085295679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 221085295679 in words is "two hundred twenty-one billion, eighty-five million, two hundred ninety-five thousand, six hundred seventy-nine".