21340214111 has 4 divisors (see below), whose sum is σ = 21415621512. Its totient is φ = 21264806712.

The previous prime is 21340214101. The next prime is 21340214141. The reversal of 21340214111 is 11141204312.

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 21340214111 - 2¹⁰ = 21340213087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21340214101) 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, 37703276 + ... + 37703841.

It is an arithmetic number, because the mean of its divisors is an integer number (5353905378).

Almost surely, 2^21340214111 is an apocalyptic number.

21340214111 is a deficient number, since it is larger than the sum of its proper divisors (75407401).

21340214111 is an equidigital number, since it uses as much as digits as its factorization.

21340214111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75407400.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21340214111 its reverse (11141204312), we get a palindrome (32481418423).

The spelling of 21340214111 in words is "twenty-one billion, three hundred forty million, two hundred fourteen thousand, one hundred eleven".