21107834 has 16 divisors (see below), whose sum is σ = 35474976. Its totient is φ = 9334800.

The previous prime is 21107791. The next prime is 21107839. The reversal of 21107834 is 43870112.

It is not an unprimeable number, because it can be changed into a prime (21107839) 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, 12152 + ... + 13779.

It is an arithmetic number, because the mean of its divisors is an integer number (2217186).

Almost surely, 2^21107834 is an apocalyptic number.

21107834 is a deficient number, since it is larger than the sum of its proper divisors (14367142).

21107834 is a wasteful number, since it uses less digits than its factorization.

21107834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25981.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21107834 is about 4594.3262835807. The cubic root of 21107834 is about 276.3638431163.

Adding to 21107834 its reverse (43870112), we get a palindrome (64977946).

It can be divided in two parts, 211078 and 34, that added together give a palindrome (211112).

The spelling of 21107834 in words is "twenty-one million, one hundred seven thousand, eight hundred thirty-four".