1216215044 has 18 divisors (see below), whose sum is σ = 2339455902. Its totient is φ = 552824800.

The previous prime is 1216215043. The next prime is 1216215047. The reversal of 1216215044 is 4405126121.

It can be written as a sum of positive squares in only one way, i.e., 1206728644 + 9486400 = 34738^2 + 3080^2 .

It is not an unprimeable number, because it can be changed into a prime (1216215041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1255937 + ... + 1256904.

Almost surely, 2^1216215044 is an apocalyptic number.

It is an amenable number.

1216215044 is a deficient number, since it is larger than the sum of its proper divisors (1123240858).

1216215044 is a wasteful number, since it uses less digits than its factorization.

1216215044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2512867 (or 2512854 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1216215044 is about 34874.2748168331. The cubic root of 1216215044 is about 1067.4235750525.

The spelling of 1216215044 in words is "one billion, two hundred sixteen million, two hundred fifteen thousand, forty-four".