1221099967 has 2 divisors, whose sum is σ = 1221099968. Its totient is φ = 1221099966.

The previous prime is 1221099947. The next prime is 1221100033. The reversal of 1221099967 is 7699901221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221099967 - 2¹¹ = 1221097919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221099947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610549983 + 610549984.

It is an arithmetic number, because the mean of its divisors is an integer number (610549984).

Almost surely, 2^1221099967 is an apocalyptic number.

1221099967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221099967 is an equidigital number, since it uses as much as digits as its factorization.

1221099967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 1221099967 is about 34944.2408273524. The cubic root of 1221099967 is about 1068.8507668654.

The spelling of 1221099967 in words is "one billion, two hundred twenty-one million, ninety-nine thousand, nine hundred sixty-seven".