1021521445 has 16 divisors (see below), whose sum is σ = 1402329600. Its totient is φ = 699778944.

The previous prime is 1021521409. The next prime is 1021521451. The reversal of 1021521445 is 5441251201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021521445 is a prime.

It is a congruent number.

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, 22804 + ... + 50626.

It is an arithmetic number, because the mean of its divisors is an integer number (87645600).

Almost surely, 2^1021521445 is an apocalyptic number.

It is an amenable number.

1021521445 is a deficient number, since it is larger than the sum of its proper divisors (380808155).

1021521445 is a wasteful number, since it uses less digits than its factorization.

1021521445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28884.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1021521445 is about 31961.2491151394. The cubic root of 1021521445 is about 1007.1229580045.

Adding to 1021521445 its reverse (5441251201), we get a palindrome (6462772646).

The spelling of 1021521445 in words is "one billion, twenty-one million, five hundred twenty-one thousand, four hundred forty-five".