21485774 has 4 divisors (see below), whose sum is σ = 32228664. Its totient is φ = 10742886.

The previous prime is 21485771. The next prime is 21485797. The reversal of 21485774 is 47758412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21485771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5371442 + ... + 5371445.

It is an arithmetic number, because the mean of its divisors is an integer number (8057166).

Almost surely, 2^21485774 is an apocalyptic number.

21485774 is a deficient number, since it is larger than the sum of its proper divisors (10742890).

21485774 is a wasteful number, since it uses less digits than its factorization.

21485774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10742889.

The product of its digits is 62720, while the sum is 38.

The square root of 21485774 is about 4635.2749648753. The cubic root of 21485774 is about 278.0035453199.

The spelling of 21485774 in words is "twenty-one million, four hundred eighty-five thousand, seven hundred seventy-four".