21092886 has 112 divisors (see below), whose sum is σ = 53828064. Its totient is φ = 6158592.

The previous prime is 21092881. The next prime is 21092933. The reversal of 21092886 is 68829012.

It is a self number, because there is not a number n which added to its sum of digits gives 21092886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21092881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 570060 + ... + 570096.

Almost surely, 2^21092886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21092886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26914032).

21092886 is an abundant number, since it is smaller than the sum of its proper divisors (32735178).

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

21092886 is a wasteful number, since it uses less digits than its factorization.

21092886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 21092886 is about 4592.6992063491. The cubic root of 21092886 is about 276.2985898983.

It can be divided in two parts, 210 and 92886, that added together give a triangular number (93096 = T₄₃₁).

The spelling of 21092886 in words is "twenty-one million, ninety-two thousand, eight hundred eighty-six".