21842007 has 8 divisors (see below), whose sum is σ = 31770240. Its totient is φ = 13237560.

The previous prime is 21841913. The next prime is 21842021. The reversal of 21842007 is 70024812.

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

It is not a de Polignac number, because 21842007 - 2⁷ = 21841879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21842027) 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, 330907 + ... + 330972.

It is an arithmetic number, because the mean of its divisors is an integer number (3971280).

Almost surely, 2^21842007 is an apocalyptic number.

21842007 is a deficient number, since it is larger than the sum of its proper divisors (9928233).

21842007 is a wasteful number, since it uses less digits than its factorization.

21842007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661893.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 21842007 is about 4673.5433024633. The cubic root of 21842007 is about 279.5315594221.

Adding to 21842007 its reverse (70024812), we get a palindrome (91866819).

The spelling of 21842007 in words is "twenty-one million, eight hundred forty-two thousand, seven".