21674636 has 6 divisors (see below), whose sum is σ = 37930620. Its totient is φ = 10837316.

The previous prime is 21674617. The next prime is 21674659. The reversal of 21674636 is 63647612.

It is a junction number, because it is equal to n+sod(n) for n = 21674596 and 21674605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2709326 + ... + 2709333.

It is an arithmetic number, because the mean of its divisors is an integer number (6321770).

Almost surely, 2^21674636 is an apocalyptic number.

It is an amenable number.

21674636 is a deficient number, since it is larger than the sum of its proper divisors (16255984).

21674636 is a wasteful number, since it uses less digits than its factorization.

21674636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5418663 (or 5418661 counting only the distinct ones).

The product of its digits is 36288, while the sum is 35.

The square root of 21674636 is about 4655.6026462747. The cubic root of 21674636 is about 278.8157294373.

The spelling of 21674636 in words is "twenty-one million, six hundred seventy-four thousand, six hundred thirty-six".