21373106 has 8 divisors (see below), whose sum is σ = 32085660. Its totient is φ = 10677888.

The previous prime is 21373103. The next prime is 21373111. The reversal of 21373106 is 60137312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21114025 + 259081 = 4595^2 + 509^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21373103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611 + ... + 6566.

Almost surely, 2^21373106 is an apocalyptic number.

21373106 is a deficient number, since it is larger than the sum of its proper divisors (10712554).

21373106 is a wasteful number, since it uses less digits than its factorization.

21373106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8668.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 21373106 is about 4623.1056661080. The cubic root of 21373106 is about 277.5167579091.

The spelling of 21373106 in words is "twenty-one million, three hundred seventy-three thousand, one hundred six".