1020371021 has 2 divisors, whose sum is σ = 1020371022. Its totient is φ = 1020371020.

The previous prime is 1020371017. The next prime is 1020371047. The reversal of 1020371021 is 1201730201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 604618921 + 415752100 = 24589^2 + 20390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020371021 - 2² = 1020371017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020371321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510185510 + 510185511.

It is an arithmetic number, because the mean of its divisors is an integer number (510185511).

Almost surely, 2^1020371021 is an apocalyptic number.

It is an amenable number.

1020371021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020371021 is an equidigital number, since it uses as much as digits as its factorization.

1020371021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 1020371021 is about 31943.2468762961. The cubic root of 1020371021 is about 1006.7447464522.

The spelling of 1020371021 in words is "one billion, twenty million, three hundred seventy-one thousand, twenty-one".