21225348 has 48 divisors (see below), whose sum is σ = 55440000. Its totient is φ = 7022304.

The previous prime is 21225329. The next prime is 21225349. The reversal of 21225348 is 84352212.

21225348 is a `hidden beast` number, since 2 + 122 + 534 + 8 = 666.

It is a super-2 number, since 2×21225348² = 901030795442208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21225349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15433 + ... + 16751.

It is an arithmetic number, because the mean of its divisors is an integer number (1155000).

Almost surely, 2^21225348 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 21225348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27720000).

21225348 is an abundant number, since it is smaller than the sum of its proper divisors (34214652).

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

21225348 is a wasteful number, since it uses less digits than its factorization.

21225348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1473 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21225348 is about 4607.0975678837. The cubic root of 21225348 is about 276.8757626430.

The spelling of 21225348 in words is "twenty-one million, two hundred twenty-five thousand, three hundred forty-eight".