1121221999 has 2 divisors, whose sum is σ = 1121222000. Its totient is φ = 1121221998.

The previous prime is 1121221993. The next prime is 1121222051. The reversal of 1121221999 is 9991221211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121221999 - 2¹¹ = 1121219951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121221993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560610999 + 560611000.

It is an arithmetic number, because the mean of its divisors is an integer number (560611000).

Almost surely, 2^1121221999 is an apocalyptic number.

1121221999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121221999 is an equidigital number, since it uses as much as digits as its factorization.

1121221999 is an evil number, because the sum of its binary digits is even.

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

The square root of 1121221999 is about 33484.6531861986. The cubic root of 1121221999 is about 1038.8763749120.

The spelling of 1121221999 in words is "one billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred ninety-nine".