1020564021 has 8 divisors (see below), whose sum is σ = 1392397600. Its totient is φ = 664553232.

The previous prime is 1020564001. The next prime is 1020564031. The reversal of 1020564021 is 1204650201.

1020564021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020564021 - 2¹⁹ = 1020039733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020564001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3955546 + ... + 3955803.

It is an arithmetic number, because the mean of its divisors is an integer number (174049700).

Almost surely, 2^1020564021 is an apocalyptic number.

It is an amenable number.

1020564021 is a deficient number, since it is larger than the sum of its proper divisors (371833579).

1020564021 is an equidigital number, since it uses as much as digits as its factorization.

1020564021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7911395.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1020564021 is about 31946.2677162763. The cubic root of 1020564021 is about 1006.8082166615.

The spelling of 1020564021 in words is "one billion, twenty million, five hundred sixty-four thousand, twenty-one".