21831082 has 24 divisors (see below), whose sum is σ = 40529376. Its totient is φ = 8635536.

The previous prime is 21831067. The next prime is 21831091. The reversal of 21831082 is 28013812.

It is a super-2 number, since 2×21831082² = 953192282581448, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2248 + ... + 6979.

It is an arithmetic number, because the mean of its divisors is an integer number (1688724).

Almost surely, 2^21831082 is an apocalyptic number.

21831082 is a deficient number, since it is larger than the sum of its proper divisors (18698294).

21831082 is a wasteful number, since it uses less digits than its factorization.

21831082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9262 (or 9249 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 21831082 is about 4672.3743428796. The cubic root of 21831082 is about 279.4849460073.

Adding to 21831082 its reverse (28013812), we get a palindrome (49844894).

The spelling of 21831082 in words is "twenty-one million, eight hundred thirty-one thousand, eighty-two".