21140430211 has 4 divisors (see below), whose sum is σ = 21142144624. Its totient is φ = 21138715800.

The previous prime is 21140430187. The next prime is 21140430221. The reversal of 21140430211 is 11203404112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21140430211 - 2⁹ = 21140429699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140430221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838575 + ... + 863416.

It is an arithmetic number, because the mean of its divisors is an integer number (5285536156).

Almost surely, 2^21140430211 is an apocalyptic number.

21140430211 is a deficient number, since it is larger than the sum of its proper divisors (1714413).

21140430211 is a wasteful number, since it uses less digits than its factorization.

21140430211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714412.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21140430211 its reverse (11203404112), we get a palindrome (32343834323).

The spelling of 21140430211 in words is "twenty-one billion, one hundred forty million, four hundred thirty thousand, two hundred eleven".