1216214413 has 4 divisors (see below), whose sum is σ = 1255447168. Its totient is φ = 1176981660.

The previous prime is 1216214371. The next prime is 1216214429. The reversal of 1216214413 is 3144126121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216214413 - 2²⁹ = 679343501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216214113) 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, 19616331 + ... + 19616392.

It is an arithmetic number, because the mean of its divisors is an integer number (313861792).

Almost surely, 2^1216214413 is an apocalyptic number.

It is an amenable number.

1216214413 is a deficient number, since it is larger than the sum of its proper divisors (39232755).

1216214413 is an equidigital number, since it uses as much as digits as its factorization.

1216214413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39232754.

The product of its digits is 1152, while the sum is 25.

The square root of 1216214413 is about 34874.2657700488. The cubic root of 1216214413 is about 1067.4233904513.

The spelling of 1216214413 in words is "one billion, two hundred sixteen million, two hundred fourteen thousand, four hundred thirteen".