21093030 has 72 divisors (see below), whose sum is σ = 63808992. Its totient is φ = 4820256.

The previous prime is 21093029. The next prime is 21093041. The reversal of 21093030 is 3039012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21092994 and 21093012.

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, 2019 + ... + 6801.

It is an arithmetic number, because the mean of its divisors is an integer number (886236).

Almost surely, 2^21093030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21093030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31904496).

21093030 is an abundant number, since it is smaller than the sum of its proper divisors (42715962).

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

21093030 is a wasteful number, since it uses less digits than its factorization.

21093030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810 (or 4800 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 21093030 is about 4592.7148833778. The cubic root of 21093030 is about 276.2992186554.

The spelling of 21093030 in words is "twenty-one million, ninety-three thousand, thirty".