221020120999 has 2 divisors, whose sum is σ = 221020121000. Its totient is φ = 221020120998.

The previous prime is 221020120939. The next prime is 221020121011. The reversal of 221020120999 is 999021020122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221020120999 - 2²⁹ = 220483250087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020120939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510060499 + 110510060500.

It is an arithmetic number, because the mean of its divisors is an integer number (110510060500).

Almost surely, 2^221020120999 is an apocalyptic number.

221020120999 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020120999 is an equidigital number, since it uses as much as digits as its factorization.

221020120999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The spelling of 221020120999 in words is "two hundred twenty-one billion, twenty million, one hundred twenty thousand, nine hundred ninety-nine".