21103852 has 36 divisors (see below), whose sum is σ = 46401040. Its totient is φ = 8220960.

The previous prime is 21103847. The next prime is 21103879. The reversal of 21103852 is 25830112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 274 + ... + 6502.

Almost surely, 2^21103852 is an apocalyptic number.

21103852 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23200520).

21103852 is an abundant number, since it is smaller than the sum of its proper divisors (25297188).

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

21103852 is a wasteful number, since it uses less digits than its factorization.

21103852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6262 (or 6249 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21103852 is about 4593.8929025392. The cubic root of 21103852 is about 276.3464633127.

Adding to 21103852 its reverse (25830112), we get a palindrome (46933964).

The spelling of 21103852 in words is "twenty-one million, one hundred three thousand, eight hundred fifty-two".