1214879921 has 2 divisors, whose sum is σ = 1214879922. Its totient is φ = 1214879920.

The previous prime is 1214879873. The next prime is 1214879927. The reversal of 1214879921 is 1299784121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 901200400 + 313679521 = 30020^2 + 17711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1214879921 - 2¹⁰ = 1214878897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1214879927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607439960 + 607439961.

It is an arithmetic number, because the mean of its divisors is an integer number (607439961).

Almost surely, 2^1214879921 is an apocalyptic number.

It is an amenable number.

1214879921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1214879921 is an equidigital number, since it uses as much as digits as its factorization.

1214879921 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1214879921 is about 34855.1276141689. The cubic root of 1214879921 is about 1067.0328372514.

The spelling of 1214879921 in words is "one billion, two hundred fourteen million, eight hundred seventy-nine thousand, nine hundred twenty-one".