21134213 has 16 divisors (see below), whose sum is σ = 23976000. Its totient is φ = 18508032.

The previous prime is 21134173. The next prime is 21134221. The reversal of 21134213 is 31243112.

It is a cyclic number.

It is not a de Polignac number, because 21134213 - 2²⁴ = 4356997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21134191 and 21134200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18503 + ... + 19611.

It is an arithmetic number, because the mean of its divisors is an integer number (1498500).

Almost surely, 2^21134213 is an apocalyptic number.

It is an amenable number.

21134213 is a deficient number, since it is larger than the sum of its proper divisors (2841787).

21134213 is a wasteful number, since it uses less digits than its factorization.

21134213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204.

The product of its digits is 144, while the sum is 17.

The square root of 21134213 is about 4597.1962107354. The cubic root of 21134213 is about 276.4789215118.

Adding to 21134213 its reverse (31243112), we get a palindrome (52377325).

The spelling of 21134213 in words is "twenty-one million, one hundred thirty-four thousand, two hundred thirteen".