21418007 has 8 divisors (see below), whose sum is σ = 23148384. Its totient is φ = 19699488.

The previous prime is 21417973. The next prime is 21418009. The reversal of 21418007 is 70081412.

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

It is a cyclic number.

It is not a de Polignac number, because 21418007 - 2¹⁸ = 21155863 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 (21418009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (2893548).

Almost surely, 2^21418007 is an apocalyptic number.

21418007 is a deficient number, since it is larger than the sum of its proper divisors (1730377).

21418007 is a wasteful number, since it uses less digits than its factorization.

21418007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21418007 is about 4627.9592694837. The cubic root of 21418007 is about 277.7109593535.

Adding to 21418007 its reverse (70081412), we get a palindrome (91499419).

The spelling of 21418007 in words is "twenty-one million, four hundred eighteen thousand, seven".