21107394 has 96 divisors (see below), whose sum is σ = 57972096. Its totient is φ = 5391360.

The previous prime is 21107393. The next prime is 21107407. The reversal of 21107394 is 49370112.

It is not an unprimeable number, because it can be changed into a prime (21107393) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134364 + ... + 134520.

It is an arithmetic number, because the mean of its divisors is an integer number (603876).

Almost surely, 2^21107394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21107394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28986048).

21107394 is an abundant number, since it is smaller than the sum of its proper divisors (36864702).

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

21107394 is a wasteful number, since it uses less digits than its factorization.

21107394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21107394 is about 4594.2783981818. The cubic root of 21107394 is about 276.3619228035.

The spelling of 21107394 in words is "twenty-one million, one hundred seven thousand, three hundred ninety-four".