2021853021 has 4 divisors (see below), whose sum is σ = 2695804032. Its totient is φ = 1347902012.

The previous prime is 2021853017. The next prime is 2021853091. The reversal of 2021853021 is 1203581202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2021853021 - 2² = 2021853017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021852982 and 2021853000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021853011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336975501 + ... + 336975506.

It is an arithmetic number, because the mean of its divisors is an integer number (673951008).

Almost surely, 2^2021853021 is an apocalyptic number.

It is an amenable number.

2021853021 is a deficient number, since it is larger than the sum of its proper divisors (673951011).

2021853021 is an equidigital number, since it uses as much as digits as its factorization.

2021853021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673951010.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 2021853021 is about 44965.0199710842. The cubic root of 2021853021 is about 1264.4932841157.

The spelling of 2021853021 in words is "two billion, twenty-one million, eight hundred fifty-three thousand, twenty-one".