1244021142 has 64 divisors (see below), whose sum is σ = 3090447360. Its totient is φ = 325067904.

The previous prime is 1244021123. The next prime is 1244021147. The reversal of 1244021142 is 2411204421.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244021147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49063 + ... + 69965.

It is an arithmetic number, because the mean of its divisors is an integer number (48288240).

Almost surely, 2^1244021142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1244021142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545223680).

1244021142 is an abundant number, since it is smaller than the sum of its proper divisors (1846426218).

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

1244021142 is a wasteful number, since it uses less digits than its factorization.

1244021142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21037.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1244021142 is about 35270.6838890317. The cubic root of 1244021142 is about 1075.4971248957.

Adding to 1244021142 its reverse (2411204421), we get a palindrome (3655225563).

The spelling of 1244021142 in words is "one billion, two hundred forty-four million, twenty-one thousand, one hundred forty-two".