21038834 has 8 divisors (see below), whose sum is σ = 31632768. Its totient is φ = 10494580.

The previous prime is 21038821. The next prime is 21038837. The reversal of 21038834 is 43883012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21038797 and 21038806.

It is not an unprimeable number, because it can be changed into a prime (21038837) 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, 11342 + ... + 13065.

It is an arithmetic number, because the mean of its divisors is an integer number (3954096).

Almost surely, 2^21038834 is an apocalyptic number.

21038834 is a deficient number, since it is larger than the sum of its proper divisors (10593934).

21038834 is a wasteful number, since it uses less digits than its factorization.

21038834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24840.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 21038834 is about 4586.8108746710. The cubic root of 21038834 is about 276.0623765059.

The spelling of 21038834 in words is "twenty-one million, thirty-eight thousand, eight hundred thirty-four".