21086058 has 32 divisors (see below), whose sum is σ = 48746880. Its totient is φ = 5955840.

The previous prime is 21086027. The next prime is 21086089. The reversal of 21086058 is 85068012.

It is an interprime number because it is at equal distance from previous prime (21086027) and next prime (21086089).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 918 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (1523340).

Almost surely, 2^21086058 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21086058, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24373440).

21086058 is an abundant number, since it is smaller than the sum of its proper divisors (27660822).

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

21086058 is a wasteful number, since it uses less digits than its factorization.

21086058 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5742.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 21086058 is about 4591.9557924701. The cubic root of 21086058 is about 276.2687730463.

It can be divided in two parts, 210 and 86058, that added together give a palindrome (86268).

The spelling of 21086058 in words is "twenty-one million, eighty-six thousand, fifty-eight".