21023882 has 16 divisors (see below), whose sum is σ = 34497792. Its totient is φ = 9529920.

The previous prime is 21023879. The next prime is 21023887. The reversal of 21023882 is 28832012.

It is a super-2 number, since 2×21023882² = 884007228699848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21023887) 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, 8423 + ... + 10629.

It is an arithmetic number, because the mean of its divisors is an integer number (2156112).

Almost surely, 2^21023882 is an apocalyptic number.

21023882 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21023882 is a deficient number, since it is larger than the sum of its proper divisors (13473910).

21023882 is a wasteful number, since it uses less digits than its factorization.

21023882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21023882 is about 4585.1806943675. The cubic root of 21023882 is about 275.9969631396.

Adding to 21023882 its reverse (28832012), we get a palindrome (49855894).

The spelling of 21023882 in words is "twenty-one million, twenty-three thousand, eight hundred eighty-two".