21330434 has 8 divisors (see below), whose sum is σ = 32136060. Its totient is φ = 10618416.

The previous prime is 21330403. The next prime is 21330443. The reversal of 21330434 is 43403312.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 198025 = 4597^2 + 445^2 .

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, 22829 + ... + 23744.

Almost surely, 2^21330434 is an apocalyptic number.

21330434 is a deficient number, since it is larger than the sum of its proper divisors (10805626).

21330434 is a wasteful number, since it uses less digits than its factorization.

21330434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46804.

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

The square root of 21330434 is about 4618.4882808122. The cubic root of 21330434 is about 277.3319448869.

Adding to 21330434 its reverse (43403312), we get a palindrome (64733746).

It can be divided in two parts, 213304 and 34, that multiplied together give a triangular number (7252336 = T₃₈₀₈).

The spelling of 21330434 in words is "twenty-one million, three hundred thirty thousand, four hundred thirty-four".