21348774 has 24 divisors (see below), whose sum is σ = 46717632. Its totient is φ = 7045200.

The previous prime is 21348773. The next prime is 21348781. The reversal of 21348774 is 47784312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4054 + ... + 7689.

It is an arithmetic number, because the mean of its divisors is an integer number (1946568).

Almost surely, 2^21348774 is an apocalyptic number.

21348774 is an abundant number, since it is smaller than the sum of its proper divisors (25368858).

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

21348774 is a wasteful number, since it uses less digits than its factorization.

21348774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11852 (or 11849 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 21348774 is about 4620.4733523742. The cubic root of 21348774 is about 277.4114058554.

It can be divided in two parts, 21348 and 774, that added together give a palindrome (22122).

The spelling of 21348774 in words is "twenty-one million, three hundred forty-eight thousand, seven hundred seventy-four".