21340211 has 8 divisors (see below), whose sum is σ = 22507920. Its totient is φ = 20176992.

The previous prime is 21340177. The next prime is 21340217. The reversal of 21340211 is 11204312.

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 21340211 - 2⁶ = 21340147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21340217) 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, 13961 + ... + 15413.

It is an arithmetic number, because the mean of its divisors is an integer number (2813490).

Almost surely, 2^21340211 is an apocalyptic number.

21340211 is a deficient number, since it is larger than the sum of its proper divisors (1167709).

21340211 is a wasteful number, since it uses less digits than its factorization.

21340211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21340211 is about 4619.5466227759. The cubic root of 21340211 is about 277.3743109612.

Adding to 21340211 its reverse (11204312), we get a palindrome (32544523).

The spelling of 21340211 in words is "twenty-one million, three hundred forty thousand, two hundred eleven".