21114221 has 8 divisors (see below), whose sum is σ = 22902264. Its totient is φ = 19386880.

The previous prime is 21114217. The next prime is 21114229. The reversal of 21114221 is 12241112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 990025 + 20124196 = 995^2 + 4486^2 .

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 21114221 - 2² = 21114217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21114196 and 21114205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114229) 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, 14450 + ... + 15843.

It is an arithmetic number, because the mean of its divisors is an integer number (2862783).

Almost surely, 2^21114221 is an apocalyptic number.

It is an amenable number.

21114221 is a deficient number, since it is larger than the sum of its proper divisors (1788043).

21114221 is a wasteful number, since it uses less digits than its factorization.

21114221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30351.

The product of its digits is 32, while the sum is 14.

The square root of 21114221 is about 4595.0213274804. The cubic root of 21114221 is about 276.3917151986.

Adding to 21114221 its reverse (12241112), we get a palindrome (33355333).

It can be divided in two parts, 2111 and 4221, that multiplied together give a triangular number (8910531 = T₄₂₂₁).

The spelling of 21114221 in words is "twenty-one million, one hundred fourteen thousand, two hundred twenty-one".