2021001023 has 4 divisors (see below), whose sum is σ = 2021269320. Its totient is φ = 2020732728.

The previous prime is 2021001001. The next prime is 2021001041. The reversal of 2021001023 is 3201001202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021001023 - 2⁶ = 2021000959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021000995 and 2021001013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021001043) 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, 122513 + ... + 138026.

It is an arithmetic number, because the mean of its divisors is an integer number (505317330).

Almost surely, 2^2021001023 is an apocalyptic number.

2021001023 is a deficient number, since it is larger than the sum of its proper divisors (268297).

2021001023 is an equidigital number, since it uses as much as digits as its factorization.

2021001023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268296.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2021001023 is about 44955.5449638863. The cubic root of 2021001023 is about 1264.3156422689.

Adding to 2021001023 its reverse (3201001202), we get a palindrome (5222002225).

The spelling of 2021001023 in words is "two billion, twenty-one million, one thousand, twenty-three".