1216650621 has 8 divisors (see below), whose sum is σ = 1623071680. Its totient is φ = 810664992.

The previous prime is 1216650587. The next prime is 1216650629. The reversal of 1216650621 is 1260566121.

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

It is not a de Polignac number, because 1216650621 - 2⁷ = 1216650493 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 (1216650629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102280 + ... + 113553.

It is an arithmetic number, because the mean of its divisors is an integer number (202883960).

Almost surely, 2^1216650621 is an apocalyptic number.

It is an amenable number.

1216650621 is a deficient number, since it is larger than the sum of its proper divisors (406421059).

1216650621 is a wasteful number, since it uses less digits than its factorization.

1216650621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217715.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1216650621 is about 34880.5192191859. The cubic root of 1216650621 is about 1067.5509893796.

The spelling of 1216650621 in words is "one billion, two hundred sixteen million, six hundred fifty thousand, six hundred twenty-one".