221221221110999 has 2 divisors, whose sum is σ = 221221221111000. Its totient is φ = 221221221110998.

The previous prime is 221221221110983. The next prime is 221221221111101. The reversal of 221221221110999 is 999011122122122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221221221110999 - 2⁴ = 221221221110983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221221110969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610610555499 + 110610610555500.

It is an arithmetic number, because the mean of its divisors is an integer number (110610610555500).

Almost surely, 2^{221221221110999} is an apocalyptic number.

221221221110999 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221221110999 is an equidigital number, since it uses as much as digits as its factorization.

221221221110999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 44.

The spelling of 221221221110999 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred ten thousand, nine hundred ninety-nine".