21230374 has 16 divisors (see below), whose sum is σ = 35589456. Its totient is φ = 9414400.

The previous prime is 21230359. The next prime is 21230389. The reversal of 21230374 is 47303212.

It is an interprime number because it is at equal distance from previous prime (21230359) and next prime (21230389).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10867 + ... + 12670.

It is an arithmetic number, because the mean of its divisors is an integer number (2224341).

Almost surely, 2^21230374 is an apocalyptic number.

21230374 is a deficient number, since it is larger than the sum of its proper divisors (14359082).

21230374 is a wasteful number, since it uses less digits than its factorization.

21230374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23591.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21230374 is about 4607.6429983235. The cubic root of 21230374 is about 276.8976149389.

Adding to 21230374 its reverse (47303212), we get a palindrome (68533586).

The spelling of 21230374 in words is "twenty-one million, two hundred thirty thousand, three hundred seventy-four".