221999737879 has 2 divisors, whose sum is σ = 221999737880. Its totient is φ = 221999737878.

The previous prime is 221999737823. The next prime is 221999737901. The reversal of 221999737879 is 978737999122.

221999737879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221999737879 - 2²⁵ = 221966183447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221999737079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110999868939 + 110999868940.

It is an arithmetic number, because the mean of its divisors is an integer number (110999868940).

Almost surely, 2^221999737879 is an apocalyptic number.

221999737879 is a deficient number, since it is larger than the sum of its proper divisors (1).

221999737879 is an equidigital number, since it uses as much as digits as its factorization.

221999737879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216040608, while the sum is 73.

The spelling of 221999737879 in words is "two hundred twenty-one billion, nine hundred ninety-nine million, seven hundred thirty-seven thousand, eight hundred seventy-nine".