21494322 has 48 divisors (see below), whose sum is σ = 49375872. Its totient is φ = 7004880.

The previous prime is 21494311. The next prime is 21494329. The reversal of 21494322 is 22349412.

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 (21494329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22372 + ... + 23312.

It is an arithmetic number, because the mean of its divisors is an integer number (1028664).

Almost surely, 2^21494322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21494322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24687936).

21494322 is an abundant number, since it is smaller than the sum of its proper divisors (27881550).

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

21494322 is an equidigital number, since it uses as much as digits as its factorization.

21494322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005 (or 993 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21494322 is about 4636.1969328319. The cubic root of 21494322 is about 278.0404078386.

The spelling of 21494322 in words is "twenty-one million, four hundred ninety-four thousand, three hundred twenty-two".