21855704 has 32 divisors (see below), whose sum is σ = 46055520. Its totient is φ = 9647616.

The previous prime is 21855697. The next prime is 21855709. The reversal of 21855704 is 40755812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21855709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2177 + ... + 6960.

It is an arithmetic number, because the mean of its divisors is an integer number (1439235).

Almost surely, 2^21855704 is an apocalyptic number.

It is an amenable number.

21855704 is an abundant number, since it is smaller than the sum of its proper divisors (24199816).

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

21855704 is a wasteful number, since it uses less digits than its factorization.

21855704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9179 (or 9175 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 21855704 is about 4675.0084491902. The cubic root of 21855704 is about 279.5899781031.

The spelling of 21855704 in words is "twenty-one million, eight hundred fifty-five thousand, seven hundred four".