21834007 has 4 divisors (see below), whose sum is σ = 23513560. Its totient is φ = 20154456.

The previous prime is 21833963. The next prime is 21834011. The reversal of 21834007 is 70043812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21834007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21834037) 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, 839757 + ... + 839782.

It is an arithmetic number, because the mean of its divisors is an integer number (5878390).

Almost surely, 2^21834007 is an apocalyptic number.

21834007 is a deficient number, since it is larger than the sum of its proper divisors (1679553).

21834007 is a wasteful number, since it uses less digits than its factorization.

21834007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1679552.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21834007 is about 4672.6873424187. The cubic root of 21834007 is about 279.4974275533.

Adding to 21834007 its reverse (70043812), we get a palindrome (91877819).

It can be divided in two parts, 218 and 34007, that added together give a square (34225 = 185²).

The spelling of 21834007 in words is "twenty-one million, eight hundred thirty-four thousand, seven".