21140213 has 2 divisors, whose sum is σ = 21140214. Its totient is φ = 21140212.

The previous prime is 21140201. The next prime is 21140237. The reversal of 21140213 is 31204112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20232004 + 908209 = 4498^2 + 953^2 .

It is a cyclic number.

It is not a de Polignac number, because 21140213 - 2⁶ = 21140149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21140513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570106 + 10570107.

It is an arithmetic number, because the mean of its divisors is an integer number (10570107).

Almost surely, 2^21140213 is an apocalyptic number.

It is an amenable number.

21140213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21140213 is an equidigital number, since it uses as much as digits as its factorization.

21140213 is an evil number, because the sum of its binary digits is even.

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

The square root of 21140213 is about 4597.8487360939. The cubic root of 21140213 is about 276.5050831448.

Adding to 21140213 its reverse (31204112), we get a palindrome (52344325).

The spelling of 21140213 in words is "twenty-one million, one hundred forty thousand, two hundred thirteen".