1021521444 has 12 divisors (see below), whose sum is σ = 2383550064. Its totient is φ = 340507144.

The previous prime is 1021521409. The next prime is 1021521451. The reversal of 1021521444 is 4441251201.

1021521444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42563382 + ... + 42563405.

It is an arithmetic number, because the mean of its divisors is an integer number (198629172).

Almost surely, 2^1021521444 is an apocalyptic number.

It is an amenable number.

1021521444 is an abundant number, since it is smaller than the sum of its proper divisors (1362028620).

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

1021521444 is a wasteful number, since it uses less digits than its factorization.

1021521444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85126794 (or 85126792 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 1021521444 is about 31961.2490994955. The cubic root of 1021521444 is about 1007.1229576759.

Adding to 1021521444 its reverse (4441251201), we get a palindrome (5462772645).

The spelling of 1021521444 in words is "one billion, twenty-one million, five hundred twenty-one thousand, four hundred forty-four".