21086030 has 32 divisors (see below), whose sum is σ = 43600896. Its totient is φ = 7192224.

The previous prime is 21086027. The next prime is 21086089. The reversal of 21086030 is 3068012.

It is a super-2 number, since 2×21086030² = 889241322321800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21085993 and 21086011.

It is a congruent number.

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, 15227 + ... + 16553.

It is an arithmetic number, because the mean of its divisors is an integer number (1362528).

Almost surely, 2^21086030 is an apocalyptic number.

21086030 is an abundant number, since it is smaller than the sum of its proper divisors (22514866).

21086030 is a wasteful number, since it uses less digits than its factorization.

21086030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21086030 is about 4591.9527436593. The cubic root of 21086030 is about 276.2686507613.

The spelling of 21086030 in words is "twenty-one million, eighty-six thousand, thirty".