21106474 has 16 divisors (see below), whose sum is σ = 33175296. Its totient is φ = 10058400.

The previous prime is 21106471. The next prime is 21106523. The reversal of 21106474 is 47460112.

It is not an unprimeable number, because it can be changed into a prime (21106471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1614 + ... + 6694.

It is an arithmetic number, because the mean of its divisors is an integer number (2073456).

Almost surely, 2^21106474 is an apocalyptic number.

21106474 is a deficient number, since it is larger than the sum of its proper divisors (12068822).

21106474 is a wasteful number, since it uses less digits than its factorization.

21106474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5181.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21106474 is about 4594.1782725532. The cubic root of 21106474 is about 276.3579075176.

Adding to 21106474 its reverse (47460112), we get a palindrome (68566586).

The spelling of 21106474 in words is "twenty-one million, one hundred six thousand, four hundred seventy-four".