21010330 has 32 divisors (see below), whose sum is σ = 41446080. Its totient is φ = 7605120.

The previous prime is 21010321. The next prime is 21010337. The reversal of 21010330 is 3301012.

21010330 = 562² + 563² + ... + 621².

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21010337) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 44757 + ... + 45223.

It is an arithmetic number, because the mean of its divisors is an integer number (1295190).

Almost surely, 2^21010330 is an apocalyptic number.

21010330 is a deficient number, since it is larger than the sum of its proper divisors (20435750).

21010330 is a wasteful number, since it uses less digits than its factorization.

21010330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21010330 is about 4583.7026517871. The cubic root of 21010330 is about 275.9376478206.

Adding to 21010330 its reverse (3301012), we get a palindrome (24311342).

The spelling of 21010330 in words is "twenty-one million, ten thousand, three hundred thirty".