21140311 has 4 divisors (see below), whose sum is σ = 21337992. Its totient is φ = 20942632.

The previous prime is 21140303. The next prime is 21140341. The reversal of 21140311 is 11304112.

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 21140311 - 2³ = 21140303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21140291 and 21140300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140341) 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, 98680 + ... + 98893.

It is an arithmetic number, because the mean of its divisors is an integer number (5334498).

Almost surely, 2^21140311 is an apocalyptic number.

21140311 is a deficient number, since it is larger than the sum of its proper divisors (197681).

21140311 is a wasteful number, since it uses less digits than its factorization.

21140311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197680.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21140311 is about 4597.8593932394. The cubic root of 21140311 is about 276.5055104104.

Adding to 21140311 its reverse (11304112), we get a palindrome (32444423).

The spelling of 21140311 in words is "twenty-one million, one hundred forty thousand, three hundred eleven".