21735938 has 8 divisors (see below), whose sum is σ = 37261632. Its totient is φ = 9315396.

The previous prime is 21735937. The next prime is 21736003. The reversal of 21735938 is 83953712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21735937) 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, 776270 + ... + 776297.

It is an arithmetic number, because the mean of its divisors is an integer number (4657704).

Almost surely, 2^21735938 is an apocalyptic number.

21735938 is a deficient number, since it is larger than the sum of its proper divisors (15525694).

21735938 is a wasteful number, since it uses less digits than its factorization.

21735938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552576.

The product of its digits is 45360, while the sum is 38.

The square root of 21735938 is about 4662.1816781417. The cubic root of 21735938 is about 279.0783385915.

The spelling of 21735938 in words is "twenty-one million, seven hundred thirty-five thousand, nine hundred thirty-eight".