21037086 has 48 divisors (see below), whose sum is σ = 52416000. Its totient is φ = 5973264.

The previous prime is 21037061. The next prime is 21037103. The reversal of 21037086 is 68073012.

21037086 is a `hidden beast` number, since 210 + 370 + 86 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24655 + ... + 25493.

It is an arithmetic number, because the mean of its divisors is an integer number (1092000).

Almost surely, 2^21037086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21037086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26208000).

21037086 is an abundant number, since it is smaller than the sum of its proper divisors (31378914).

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

21037086 is a wasteful number, since it uses less digits than its factorization.

21037086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053 (or 1050 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21037086 is about 4586.6203243783. The cubic root of 21037086 is about 276.0547307971.

The spelling of 21037086 in words is "twenty-one million, thirty-seven thousand, eighty-six".