21435274 has 8 divisors (see below), whose sum is σ = 36746208. Its totient is φ = 9186540.

The previous prime is 21435259. The next prime is 21435299. The reversal of 21435274 is 47253412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 765532 + ... + 765559.

It is an arithmetic number, because the mean of its divisors is an integer number (4593276).

Almost surely, 2^21435274 is an apocalyptic number.

21435274 is a deficient number, since it is larger than the sum of its proper divisors (15310934).

21435274 is a wasteful number, since it uses less digits than its factorization.

21435274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531100.

The product of its digits is 6720, while the sum is 28.

The square root of 21435274 is about 4629.8244027177. The cubic root of 21435274 is about 277.7855686467.

Adding to 21435274 its reverse (47253412), we get a palindrome (68688686).

The spelling of 21435274 in words is "twenty-one million, four hundred thirty-five thousand, two hundred seventy-four".