21482274 has 64 divisors (see below), whose sum is σ = 50780160. Its totient is φ = 5987520.

The previous prime is 21482273. The next prime is 21482281. The reversal of 21482274 is 47228412.

It is a super-2 number, since 2×21482274² = 922976192422152, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21482273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46167 + ... + 46629.

It is an arithmetic number, because the mean of its divisors is an integer number (793440).

Almost surely, 2^21482274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21482274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25390080).

21482274 is an abundant number, since it is smaller than the sum of its proper divisors (29297886).

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

21482274 is a wasteful number, since it uses less digits than its factorization.

21482274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535.

The product of its digits is 7168, while the sum is 30.

The square root of 21482274 is about 4634.8974098679. The cubic root of 21482274 is about 277.9884490482.

The spelling of 21482274 in words is "twenty-one million, four hundred eighty-two thousand, two hundred seventy-four".