1221220344 has 16 divisors (see below), whose sum is σ = 3053050920. Its totient is φ = 407073440.

The previous prime is 1221220327. The next prime is 1221220361. The reversal of 1221220344 is 4430221221.

1221220344 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1221220327) and next prime (1221220361).

It is a self number, because there is not a number n which added to its sum of digits gives 1221220344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25442067 + ... + 25442114.

Almost surely, 2^1221220344 is an apocalyptic number.

It is an amenable number.

1221220344 is an abundant number, since it is smaller than the sum of its proper divisors (1831830576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221220344 is a wasteful number, since it uses less digits than its factorization.

1221220344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50884190 (or 50884186 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1221220344 is about 34945.9632003469. The cubic root of 1221220344 is about 1068.8858884292.

Adding to 1221220344 its reverse (4430221221), we get a palindrome (5651441565).

The spelling of 1221220344 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, three hundred forty-four".