21709848 has 16 divisors (see below), whose sum is σ = 54274680. Its totient is φ = 7236608.

The previous prime is 21709847. The next prime is 21709879. The reversal of 21709848 is 84890712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21709841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452265 + ... + 452312.

Almost surely, 2^21709848 is an apocalyptic number.

It is an amenable number.

21709848 is an abundant number, since it is smaller than the sum of its proper divisors (32564832).

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

21709848 is a wasteful number, since it uses less digits than its factorization.

21709848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904586 (or 904582 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 21709848 is about 4659.3827917440. The cubic root of 21709848 is about 278.9666331289.

The spelling of 21709848 in words is "twenty-one million, seven hundred nine thousand, eight hundred forty-eight".