21769474 has 4 divisors (see below), whose sum is σ = 32654214. Its totient is φ = 10884736.

The previous prime is 21769453. The next prime is 21769487. The reversal of 21769474 is 47496712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 6985449 = 3845^2 + 2643^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5442367 + ... + 5442370.

Almost surely, 2^21769474 is an apocalyptic number.

21769474 is a deficient number, since it is larger than the sum of its proper divisors (10884740).

21769474 is a wasteful number, since it uses less digits than its factorization.

21769474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10884739.

The product of its digits is 84672, while the sum is 40.

The square root of 21769474 is about 4665.7768913655. The cubic root of 21769474 is about 279.2217932075.

The spelling of 21769474 in words is "twenty-one million, seven hundred sixty-nine thousand, four hundred seventy-four".