1221104999 has 2 divisors, whose sum is σ = 1221105000. Its totient is φ = 1221104998.

The previous prime is 1221104993. The next prime is 1221105071. The reversal of 1221104999 is 9994011221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221104999 - 2²⁰ = 1220056423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221104993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610552499 + 610552500.

It is an arithmetic number, because the mean of its divisors is an integer number (610552500).

Almost surely, 2^1221104999 is an apocalyptic number.

1221104999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221104999 is an equidigital number, since it uses as much as digits as its factorization.

1221104999 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 38.

The square root of 1221104999 is about 34944.3128276977. The cubic root of 1221104999 is about 1068.8522350635.

The spelling of 1221104999 in words is "one billion, two hundred twenty-one million, one hundred four thousand, nine hundred ninety-nine".