221200102091 has 2 divisors, whose sum is σ = 221200102092. Its totient is φ = 221200102090.

The previous prime is 221200102063. The next prime is 221200102133. The reversal of 221200102091 is 190201002122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221200102091 is a prime.

It is not a weakly prime, because it can be changed into another prime (221200102021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600051045 + 110600051046.

It is an arithmetic number, because the mean of its divisors is an integer number (110600051046).

Almost surely, 2^221200102091 is an apocalyptic number.

221200102091 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200102091 is an equidigital number, since it uses as much as digits as its factorization.

221200102091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 221200102091 in words is "two hundred twenty-one billion, two hundred million, one hundred two thousand, ninety-one".