21447292 has 12 divisors (see below), whose sum is σ = 37567656. Its totient is φ = 10713680.

The previous prime is 21447289. The next prime is 21447301. The reversal of 21447292 is 29274412.

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, 4578 + ... + 7990.

It is an arithmetic number, because the mean of its divisors is an integer number (3130638).

Almost surely, 2^21447292 is an apocalyptic number.

It is an amenable number.

21447292 is a deficient number, since it is larger than the sum of its proper divisors (16120364).

21447292 is a wasteful number, since it uses less digits than its factorization.

21447292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4988 (or 4986 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 21447292 is about 4631.1221102450. The cubic root of 21447292 is about 277.8374737953.

The spelling of 21447292 in words is "twenty-one million, four hundred forty-seven thousand, two hundred ninety-two".