21831486 has 16 divisors (see below), whose sum is σ = 43856400. Its totient is φ = 7244928.

The previous prime is 21831449. The next prime is 21831493. The reversal of 21831486 is 68413812.

It is a super-2 number, since 2×21831486² = 953227561936392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6571 + ... + 9318.

It is an arithmetic number, because the mean of its divisors is an integer number (2741025).

Almost surely, 2^21831486 is an apocalyptic number.

21831486 is an abundant number, since it is smaller than the sum of its proper divisors (22024914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21831486 is a wasteful number, since it uses less digits than its factorization.

21831486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16123.

The product of its digits is 9216, while the sum is 33.

The square root of 21831486 is about 4672.4175755170. The cubic root of 21831486 is about 279.4866700205.

The spelling of 21831486 in words is "twenty-one million, eight hundred thirty-one thousand, four hundred eighty-six".