1021444144 has 80 divisors (see below), whose sum is σ = 2302852608. Its totient is φ = 429889536.

The previous prime is 1021444129. The next prime is 1021444153. The reversal of 1021444144 is 4414441201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1814007 + ... + 1814569.

Almost surely, 2^1021444144 is an apocalyptic number.

1021444144 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021444144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151426304).

1021444144 is an abundant number, since it is smaller than the sum of its proper divisors (1281408464).

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

1021444144 is a wasteful number, since it uses less digits than its factorization.

1021444144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 1021444144 is about 31960.0397997249. The cubic root of 1021444144 is about 1007.0975535532.

Adding to 1021444144 its reverse (4414441201), we get a palindrome (5435885345).

The spelling of 1021444144 in words is "one billion, twenty-one million, four hundred forty-four thousand, one hundred forty-four".