1244321220 has 24 divisors (see below), whose sum is σ = 3484099584. Its totient is φ = 331818976.

The previous prime is 1244321213. The next prime is 1244321231. The reversal of 1244321220 is 221234421.

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, 10369284 + ... + 10369403.

It is an arithmetic number, because the mean of its divisors is an integer number (145170816).

Almost surely, 2^1244321220 is an apocalyptic number.

1244321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1244321220 is an abundant number, since it is smaller than the sum of its proper divisors (2239778364).

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

1244321220 is a wasteful number, since it uses less digits than its factorization.

1244321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20738699 (or 20738697 counting only the distinct ones).

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

The square root of 1244321220 is about 35274.9375619575. The cubic root of 1244321220 is about 1075.5835937049.

Adding to 1244321220 its reverse (221234421), we get a palindrome (1465555641).

The spelling of 1244321220 in words is "one billion, two hundred forty-four million, three hundred twenty-one thousand, two hundred twenty".