1221033144 has 32 divisors (see below), whose sum is σ = 3059147520. Its totient is φ = 406135776.

The previous prime is 1221033127. The next prime is 1221033167. The reversal of 1221033144 is 4413301221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221033144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43264 + ... + 65679.

It is an arithmetic number, because the mean of its divisors is an integer number (95598360).

Almost surely, 2^1221033144 is an apocalyptic number.

It is an amenable number.

1221033144 is an abundant number, since it is smaller than the sum of its proper divisors (1838114376).

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

1221033144 is a wasteful number, since it uses less digits than its factorization.

1221033144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109419 (or 109415 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1221033144 is about 34943.2846767444. The cubic root of 1221033144 is about 1068.8312693851.

Adding to 1221033144 its reverse (4413301221), we get a palindrome (5634334365).

It can be divided in two parts, 12210 and 33144, that added together give a palindrome (45354).

The spelling of 1221033144 in words is "one billion, two hundred twenty-one million, thirty-three thousand, one hundred forty-four".