1021321444 has 48 divisors (see below), whose sum is σ = 2223317376. Its totient is φ = 403315200.

The previous prime is 1021321409. The next prime is 1021321487. The reversal of 1021321444 is 4441231201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 42792 + ... + 62239.

It is an arithmetic number, because the mean of its divisors is an integer number (46319112).

Almost surely, 2^1021321444 is an apocalyptic number.

It is an amenable number.

1021321444 is an abundant number, since it is smaller than the sum of its proper divisors (1201995932).

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

1021321444 is a wasteful number, since it uses less digits than its factorization.

1021321444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105076 (or 105074 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1021321444 is about 31958.1201574811. The cubic root of 1021321444 is about 1007.0572263952.

Adding to 1021321444 its reverse (4441231201), we get a palindrome (5462552645).

The spelling of 1021321444 in words is "one billion, twenty-one million, three hundred twenty-one thousand, four hundred forty-four".