21194928 has 60 divisors (see below), whose sum is σ = 59934160. Its totient is φ = 6991488.

The previous prime is 21194879. The next prime is 21194933. The reversal of 21194928 is 82949112.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21194892 and 21194901.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14118 + ... + 15546.

Almost surely, 2^21194928 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 21194928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29967080).

21194928 is an abundant number, since it is smaller than the sum of its proper divisors (38739232).

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

21194928 is a wasteful number, since it uses less digits than its factorization.

21194928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546 (or 1537 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 21194928 is about 4603.7949563377. The cubic root of 21194928 is about 276.7434273550.

It can be divided in two parts, 21194 and 928, that added together give a palindrome (22122).

The spelling of 21194928 in words is "twenty-one million, one hundred ninety-four thousand, nine hundred twenty-eight".