21109010 has 32 divisors (see below), whose sum is σ = 41513472. Its totient is φ = 7680960.

The previous prime is 21109007. The next prime is 21109061. The reversal of 21109010 is 1090112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8087 + ... + 10373.

It is an arithmetic number, because the mean of its divisors is an integer number (1297296).

Almost surely, 2^21109010 is an apocalyptic number.

21109010 is a deficient number, since it is larger than the sum of its proper divisors (20404462).

21109010 is a wasteful number, since it uses less digits than its factorization.

21109010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2378.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 21109010 is about 4594.4542657426. The cubic root of 21109010 is about 276.3689754580.

Adding to 21109010 its reverse (1090112), we get a palindrome (22199122).

The spelling of 21109010 in words is "twenty-one million, one hundred nine thousand, ten".