221100121999 has 2 divisors, whose sum is σ = 221100122000. Its totient is φ = 221100121998.

The previous prime is 221100121987. The next prime is 221100122011. The reversal of 221100121999 is 999121001122.

It is a balanced prime because it is at equal distance from previous prime (221100121987) and next prime (221100122011).

It is a cyclic number.

It is not a de Polignac number, because 221100121999 - 2⁵ = 221100121967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221100121909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550060999 + 110550061000.

It is an arithmetic number, because the mean of its divisors is an integer number (110550061000).

Almost surely, 2^221100121999 is an apocalyptic number.

221100121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

221100121999 is an equidigital number, since it uses as much as digits as its factorization.

221100121999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 37.

The spelling of 221100121999 in words is "two hundred twenty-one billion, one hundred million, one hundred twenty-one thousand, nine hundred ninety-nine".