221956079101 has 2 divisors, whose sum is σ = 221956079102. Its totient is φ = 221956079100.

The previous prime is 221956079087. The next prime is 221956079179. The reversal of 221956079101 is 101970659122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179902374201 + 42053704900 = 424149^2 + 205070^2 .

It is a cyclic number.

It is not a de Polignac number, because 221956079101 - 2⁵ = 221956079069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221956079701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110978039550 + 110978039551.

It is an arithmetic number, because the mean of its divisors is an integer number (110978039551).

Almost surely, 2^221956079101 is an apocalyptic number.

It is an amenable number.

221956079101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221956079101 is an equidigital number, since it uses as much as digits as its factorization.

221956079101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 43.

The spelling of 221956079101 in words is "two hundred twenty-one billion, nine hundred fifty-six million, seventy-nine thousand, one hundred one".