21746474 has 4 divisors (see below), whose sum is σ = 32619714. Its totient is φ = 10873236.

The previous prime is 21746471. The next prime is 21746497. The reversal of 21746474 is 47464712.

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., 11868025 + 9878449 = 3445^2 + 3143^2 .

It is not an unprimeable number, because it can be changed into a prime (21746471) by changing a digit.

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 as a sum of consecutive naturals, namely, 5436617 + ... + 5436620.

Almost surely, 2^21746474 is an apocalyptic number.

21746474 is a deficient number, since it is larger than the sum of its proper divisors (10873240).

21746474 is a wasteful number, since it uses less digits than its factorization.

21746474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10873239.

The product of its digits is 37632, while the sum is 35.

The square root of 21746474 is about 4663.3114843424. The cubic root of 21746474 is about 279.1234235933.

The spelling of 21746474 in words is "twenty-one million, seven hundred forty-six thousand, four hundred seventy-four".