21614207 has 4 divisors (see below), whose sum is σ = 21716856. Its totient is φ = 21511560.

The previous prime is 21614183. The next prime is 21614209. The reversal of 21614207 is 70241612.

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

It is a cyclic number.

It is not a de Polignac number, because 21614207 - 2⁶ = 21614143 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 (21614209) 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, 51008 + ... + 51429.

It is an arithmetic number, because the mean of its divisors is an integer number (5429214).

Almost surely, 2^21614207 is an apocalyptic number.

21614207 is a deficient number, since it is larger than the sum of its proper divisors (102649).

21614207 is a wasteful number, since it uses less digits than its factorization.

21614207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102648.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21614207 is about 4649.1081940518. The cubic root of 21614207 is about 278.5563750170.

Adding to 21614207 its reverse (70241612), we get a palindrome (91855819).

The spelling of 21614207 in words is "twenty-one million, six hundred fourteen thousand, two hundred seven".