1214910821 has 2 divisors, whose sum is σ = 1214910822. Its totient is φ = 1214910820.

The previous prime is 1214910791. The next prime is 1214910841. The reversal of 1214910821 is 1280194121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1053976225 + 160934596 = 32465^2 + 12686^2 .

It is an emirp because it is prime and its reverse (1280194121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1214910821 - 2¹⁰ = 1214909797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1214910841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607455410 + 607455411.

It is an arithmetic number, because the mean of its divisors is an integer number (607455411).

Almost surely, 2^1214910821 is an apocalyptic number.

It is an amenable number.

1214910821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1214910821 is an equidigital number, since it uses as much as digits as its factorization.

1214910821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1214910821 is about 34855.5708746823. The cubic root of 1214910821 is about 1067.0418836969.

The spelling of 1214910821 in words is "one billion, two hundred fourteen million, nine hundred ten thousand, eight hundred twenty-one".