2021723 has 16 divisors (see below), whose sum is σ = 2356992. Its totient is φ = 1716000.

The previous prime is 2021711. The next prime is 2021729. The reversal of 2021723 is 3271202.

It is not a de Polignac number, because 2021723 - 2⁶ = 2021659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15368 + ... + 15498.

It is an arithmetic number, because the mean of its divisors is an integer number (147312).

2^2021723 is an apocalyptic number.

2021723 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2021723 is a deficient number, since it is larger than the sum of its proper divisors (335269).

2021723 is a wasteful number, since it uses less digits than its factorization.

2021723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 2021723 is about 1421.8730604382. The cubic root of 2021723 is about 126.4466177924.

Adding to 2021723 its reverse (3271202), we get a palindrome (5292925).

It can be divided in two parts, 2021 and 723, that added together give a cube (2744 = 14³).

The spelling of 2021723 in words is "two million, twenty-one thousand, seven hundred twenty-three".