1221001199 has 12 divisors (see below), whose sum is σ = 1412731320. Its totient is φ = 1051578000.

The previous prime is 1221001189. The next prime is 1221001261. The reversal of 1221001199 is 9911001221.

It is not a de Polignac number, because 1221001199 - 2¹⁶ = 1220935663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 263252 + ... + 267849.

It is an arithmetic number, because the mean of its divisors is an integer number (117727610).

Almost surely, 2^1221001199 is an apocalyptic number.

1221001199 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1221001199 is a deficient number, since it is larger than the sum of its proper divisors (191730121).

1221001199 is a wasteful number, since it uses less digits than its factorization.

1221001199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531142 (or 531131 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 1221001199 is about 34942.8275759132. The cubic root of 1221001199 is about 1068.8219482861.

The spelling of 1221001199 in words is "one billion, two hundred twenty-one million, one thousand, one hundred ninety-nine".