21303434 has 8 divisors (see below), whose sum is σ = 31999428. Its totient is φ = 10636960.

The previous prime is 21303421. The next prime is 21303467. The reversal of 21303434 is 43430312.

It can be written as a sum of positive squares in 2 ways, for example, as 18464209 + 2839225 = 4297^2 + 1685^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5477 + ... + 8520.

Almost surely, 2^21303434 is an apocalyptic number.

21303434 is a deficient number, since it is larger than the sum of its proper divisors (10695994).

21303434 is a wasteful number, since it uses less digits than its factorization.

21303434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14760.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 21303434 is about 4615.5643208605. The cubic root of 21303434 is about 277.2148801623.

Adding to 21303434 its reverse (43430312), we get a palindrome (64733746).

The spelling of 21303434 in words is "twenty-one million, three hundred three thousand, four hundred thirty-four".