21047048 has 16 divisors (see below), whose sum is σ = 43050960. Its totient is φ = 9566800.

The previous prime is 21047017. The next prime is 21047051. The reversal of 21047048 is 84074012.

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, 119498 + ... + 119673.

It is an arithmetic number, because the mean of its divisors is an integer number (2690685).

Almost surely, 2^21047048 is an apocalyptic number.

It is an amenable number.

21047048 is an abundant number, since it is smaller than the sum of its proper divisors (22003912).

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

21047048 is a wasteful number, since it uses less digits than its factorization.

21047048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239188 (or 239184 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 21047048 is about 4587.7061806528. The cubic root of 21047048 is about 276.0982986697.

The spelling of 21047048 in words is "twenty-one million, forty-seven thousand, forty-eight".