21105348 has 48 divisors (see below), whose sum is σ = 54008640. Its totient is φ = 6361600.

The previous prime is 21105341. The next prime is 21105361. The reversal of 21105348 is 84350112.

It is a super-2 number, since 2×21105348² = 890871428402208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21105341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36808 + ... + 37376.

It is an arithmetic number, because the mean of its divisors is an integer number (1125180).

Almost surely, 2^21105348 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21105348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27004320).

21105348 is an abundant number, since it is smaller than the sum of its proper divisors (32903292).

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

21105348 is a wasteful number, since it uses less digits than its factorization.

21105348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 866 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 21105348 is about 4594.0557245205. The cubic root of 21105348 is about 276.3529929980.

The spelling of 21105348 in words is "twenty-one million, one hundred five thousand, three hundred forty-eight".