1221199874 has 8 divisors (see below), whose sum is σ = 1881308028. Its totient is φ = 594097200.

The previous prime is 1221199873. The next prime is 1221199891. The reversal of 1221199874 is 4789911221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1178205625 + 42994249 = 34325^2 + 6557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1221199873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8251277 + ... + 8251424.

Almost surely, 2^1221199874 is an apocalyptic number.

1221199874 is a deficient number, since it is larger than the sum of its proper divisors (660108154).

1221199874 is a wasteful number, since it uses less digits than its factorization.

1221199874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16502740.

The product of its digits is 72576, while the sum is 44.

The square root of 1221199874 is about 34945.6703183671. The cubic root of 1221199874 is about 1068.8799162019.

The spelling of 1221199874 in words is "one billion, two hundred twenty-one million, one hundred ninety-nine thousand, eight hundred seventy-four".