1219109221 has 16 divisors (see below), whose sum is σ = 1384963200. Its totient is φ = 1062936000.

The previous prime is 1219109207. The next prime is 1219109231. The reversal of 1219109221 is 1229019121.

It is a cyclic number.

It is not a de Polignac number, because 1219109221 - 2⁷ = 1219109093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1219109221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219109231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35515 + ... + 60823.

It is an arithmetic number, because the mean of its divisors is an integer number (86560200).

Almost surely, 2^1219109221 is an apocalyptic number.

1219109221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1219109221 is a deficient number, since it is larger than the sum of its proper divisors (165853979).

1219109221 is a wasteful number, since it uses less digits than its factorization.

1219109221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25500.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1219109221 is about 34915.7446003948. The cubic root of 1219109221 is about 1068.2696056692.

It can be divided in two parts, 121910 and 9221, that added together give a palindrome (131131).

The spelling of 1219109221 in words is "one billion, two hundred nineteen million, one hundred nine thousand, two hundred twenty-one".