21434330 has 16 divisors (see below), whose sum is σ = 39826944. Its totient is φ = 8297040.

The previous prime is 21434327. The next prime is 21434341. The reversal of 21434330 is 3343412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34262 + ... + 34881.

It is an arithmetic number, because the mean of its divisors is an integer number (2489184).

Almost surely, 2^21434330 is an apocalyptic number.

21434330 is a deficient number, since it is larger than the sum of its proper divisors (18392614).

21434330 is a wasteful number, since it uses less digits than its factorization.

21434330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69181.

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

The square root of 21434330 is about 4629.7224538842. The cubic root of 21434330 is about 277.7814907356.

Adding to 21434330 its reverse (3343412), we get a palindrome (24777742).

The spelling of 21434330 in words is "twenty-one million, four hundred thirty-four thousand, three hundred thirty".