21474236 has 12 divisors (see below), whose sum is σ = 42948528. Its totient is φ = 9203232.

The previous prime is 21474223. The next prime is 21474241. The reversal of 21474236 is 63247412.

21474236 is an admirable number.

It is a super-2 number, since 2×21474236² = 922285623567392, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21474199 and 21474208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383441 + ... + 383496.

It is an arithmetic number, because the mean of its divisors is an integer number (3579044).

Almost surely, 2^21474236 is an apocalyptic number.

It is an amenable number.

21474236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21474236 is a wasteful number, since it uses less digits than its factorization.

21474236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766948 (or 766946 counting only the distinct ones).

The product of its digits is 8064, while the sum is 29.

The square root of 21474236 is about 4634.0302113819. The cubic root of 21474236 is about 277.9537731739.

The spelling of 21474236 in words is "twenty-one million, four hundred seventy-four thousand, two hundred thirty-six".