21086262 has 72 divisors (see below), whose sum is σ = 50190192. Its totient is φ = 6383520.

The previous prime is 21086251. The next prime is 21086279. The reversal of 21086262 is 26268012.

21086262 is a modest number, since divided by 6262 gives 2108 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 397828 + ... + 397880.

It is an arithmetic number, because the mean of its divisors is an integer number (697086).

Almost surely, 2^21086262 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21086262, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25095096).

21086262 is an abundant number, since it is smaller than the sum of its proper divisors (29103930).

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

21086262 is a wasteful number, since it uses less digits than its factorization.

21086262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 21086262 is about 4591.9780051738. The cubic root of 21086262 is about 276.2696639770.

The spelling of 21086262 in words is "twenty-one million, eighty-six thousand, two hundred sixty-two".