21552102 has 64 divisors (see below), whose sum is σ = 56286720. Its totient is φ = 6026400.

The previous prime is 21552077. The next prime is 21552119. The reversal of 21552102 is 20125512.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6327 + ... + 9117.

It is an arithmetic number, because the mean of its divisors is an integer number (879480).

Almost surely, 2^21552102 is an apocalyptic number.

21552102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21552102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28143360).

21552102 is an abundant number, since it is smaller than the sum of its proper divisors (34734618).

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

21552102 is a wasteful number, since it uses less digits than its factorization.

21552102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826 (or 2820 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 21552102 is about 4642.4241512382. The cubic root of 21552102 is about 278.2893232035.

Adding to 21552102 its reverse (20125512), we get a palindrome (41677614).

The spelling of 21552102 in words is "twenty-one million, five hundred fifty-two thousand, one hundred two".