21247476 has 24 divisors (see below), whose sum is σ = 49664160. Its totient is φ = 7070112.

The previous prime is 21247463. The next prime is 21247483. The reversal of 21247476 is 67474212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7915 + ... + 10253.

It is an arithmetic number, because the mean of its divisors is an integer number (2069340).

Almost surely, 2^21247476 is an apocalyptic number.

It is an amenable number.

21247476 is an abundant number, since it is smaller than the sum of its proper divisors (28416684).

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

21247476 is a wasteful number, since it uses less digits than its factorization.

21247476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103 (or 3101 counting only the distinct ones).

The product of its digits is 18816, while the sum is 33.

The square root of 21247476 is about 4609.4984542789. The cubic root of 21247476 is about 276.9719460526.

The spelling of 21247476 in words is "twenty-one million, two hundred forty-seven thousand, four hundred seventy-six".