21034330 has 32 divisors (see below), whose sum is σ = 40176000. Its totient is φ = 7906752.

The previous prime is 21034313. The next prime is 21034331. The reversal of 21034330 is 3343012.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (21034331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27939 + ... + 28681.

It is an arithmetic number, because the mean of its divisors is an integer number (1255500).

Almost surely, 2^21034330 is an apocalyptic number.

21034330 is a deficient number, since it is larger than the sum of its proper divisors (19141670).

21034330 is a wasteful number, since it uses less digits than its factorization.

21034330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21034330 is about 4586.3198754557. The cubic root of 21034330 is about 276.0426752607.

Adding to 21034330 its reverse (3343012), we get a palindrome (24377342).

The spelling of 21034330 in words is "twenty-one million, thirty-four thousand, three hundred thirty".