21100330 has 8 divisors (see below), whose sum is σ = 37980612. Its totient is φ = 8440128.

The previous prime is 21100319. The next prime is 21100351. The reversal of 21100330 is 3300112.

It can be written as a sum of positive squares in 2 ways, for example, as 20241001 + 859329 = 4499^2 + 927^2 .

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

It is a super-2 number, since 2×21100330² = 890447852217800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2110033 = 21100330 / (2 + 1 + 1 + 0 + 0 + 3 + 3 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055007 + ... + 1055026.

Almost surely, 2^21100330 is an apocalyptic number.

21100330 is a deficient number, since it is larger than the sum of its proper divisors (16880282).

21100330 is a wasteful number, since it uses less digits than its factorization.

21100330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110040.

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

The square root of 21100330 is about 4593.5095515303. The cubic root of 21100330 is about 276.3310893991.

Adding to 21100330 its reverse (3300112), we get a palindrome (24400442).

The spelling of 21100330 in words is "twenty-one million, one hundred thousand, three hundred thirty".