221401079 has 2 divisors, whose sum is σ = 221401080. Its totient is φ = 221401078.

The previous prime is 221401073. The next prime is 221401111. The reversal of 221401079 is 970104122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221401079 - 2¹² = 221396983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221401073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110700539 + 110700540.

It is an arithmetic number, because the mean of its divisors is an integer number (110700540).

Almost surely, 2^221401079 is an apocalyptic number.

221401079 is a deficient number, since it is larger than the sum of its proper divisors (1).

221401079 is an equidigital number, since it uses as much as digits as its factorization.

221401079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 221401079 is about 14879.5523790200. The cubic root of 221401079 is about 604.9598853260.

The spelling of 221401079 in words is "two hundred twenty-one million, four hundred one thousand, seventy-nine".