21260394 has 40 divisors (see below), whose sum is σ = 47916000. Its totient is φ = 7045704.

The previous prime is 21260377. The next prime is 21260413. The reversal of 21260394 is 49306212.

21260394 is a `hidden beast` number, since 212 + 60 + 394 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42357 + ... + 42855.

It is an arithmetic number, because the mean of its divisors is an integer number (1197900).

Almost surely, 2^21260394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21260394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23958000).

21260394 is an abundant number, since it is smaller than the sum of its proper divisors (26655606).

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

21260394 is a wasteful number, since it uses less digits than its factorization.

21260394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21260394 is about 4610.8994784098. The cubic root of 21260394 is about 277.0280656397.

It can be divided in two parts, 212 and 60394, that added together give a palindrome (60606).

The spelling of 21260394 in words is "twenty-one million, two hundred sixty thousand, three hundred ninety-four".