21814101 has 6 divisors (see below), whose sum is σ = 31509270. Its totient is φ = 14542728.

The previous prime is 21814087. The next prime is 21814123. The reversal of 21814101 is 10141812.

It can be written as a sum of positive squares in only one way, i.e., 20711601 + 1102500 = 4551^2 + 1050^2 .

It is not a de Polignac number, because 21814101 - 2⁵ = 21814069 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21814141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1211886 + ... + 1211903.

It is an arithmetic number, because the mean of its divisors is an integer number (5251545).

Almost surely, 2^21814101 is an apocalyptic number.

It is an amenable number.

21814101 is a deficient number, since it is larger than the sum of its proper divisors (9695169).

21814101 is a wasteful number, since it uses less digits than its factorization.

21814101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423795 (or 2423792 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 21814101 is about 4670.5568190527. The cubic root of 21814101 is about 279.4124627329.

Adding to 21814101 its reverse (10141812), we get a palindrome (31955913).

The spelling of 21814101 in words is "twenty-one million, eight hundred fourteen thousand, one hundred one".