21047276 has 12 divisors (see below), whose sum is σ = 36964872. Its totient is φ = 10485888.

The previous prime is 21047237. The next prime is 21047281. The reversal of 21047276 is 67274012.

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, 8165 + ... + 10428.

It is an arithmetic number, because the mean of its divisors is an integer number (3080406).

Almost surely, 2^21047276 is an apocalyptic number.

It is an amenable number.

21047276 is a deficient number, since it is larger than the sum of its proper divisors (15917596).

21047276 is a wasteful number, since it uses less digits than its factorization.

21047276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18880 (or 18878 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 21047276 is about 4587.7310296049. The cubic root of 21047276 is about 276.0992956454.

The spelling of 21047276 in words is "twenty-one million, forty-seven thousand, two hundred seventy-six".