21694448 has 40 divisors (see below), whose sum is σ = 45479232. Its totient is φ = 9986048.

The previous prime is 21694441. The next prime is 21694481. The reversal of 21694448 is 84449612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11936 + ... + 13632.

Almost surely, 2^21694448 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 21694448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22739616).

21694448 is an abundant number, since it is smaller than the sum of its proper divisors (23784784).

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

21694448 is a wasteful number, since it uses less digits than its factorization.

21694448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769 (or 1763 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 21694448 is about 4657.7299191774. The cubic root of 21694448 is about 278.9006553544.

The spelling of 21694448 in words is "twenty-one million, six hundred ninety-four thousand, four hundred forty-eight".