21435874 has 8 divisors (see below), whose sum is σ = 32438700. Its totient is φ = 10622976.

The previous prime is 21435871. The next prime is 21435889. The reversal of 21435874 is 47853412.

It can be written as a sum of positive squares in 2 ways, for example, as 14386849 + 7049025 = 3793^2 + 2655^2 .

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 (21435871) 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, 47199 + ... + 47650.

Almost surely, 2^21435874 is an apocalyptic number.

21435874 is a deficient number, since it is larger than the sum of its proper divisors (11002826).

21435874 is a wasteful number, since it uses less digits than its factorization.

21435874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94964.

The product of its digits is 26880, while the sum is 34.

The square root of 21435874 is about 4629.8891995381. The cubic root of 21435874 is about 277.7881604771.

The spelling of 21435874 in words is "twenty-one million, four hundred thirty-five thousand, eight hundred seventy-four".