21834842 has 4 divisors (see below), whose sum is σ = 32752266. Its totient is φ = 10917420.

The previous prime is 21834833. The next prime is 21834859. The reversal of 21834842 is 24843812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16410601 + 5424241 = 4051^2 + 2329^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21834799 and 21834808.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5458709 + ... + 5458712.

Almost surely, 2^21834842 is an apocalyptic number.

21834842 is a deficient number, since it is larger than the sum of its proper divisors (10917424).

21834842 is a wasteful number, since it uses less digits than its factorization.

21834842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10917423.

The product of its digits is 12288, while the sum is 32.

The square root of 21834842 is about 4672.7766905770. The cubic root of 21834842 is about 279.5009904567.

The spelling of 21834842 in words is "twenty-one million, eight hundred thirty-four thousand, eight hundred forty-two".