21341511211 has 4 divisors (see below), whose sum is σ = 21703231800. Its totient is φ = 20979790624.

The previous prime is 21341511167. The next prime is 21341511223. The reversal of 21341511211 is 11211514312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21341511211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341511241) 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, 180860206 + ... + 180860323.

It is an arithmetic number, because the mean of its divisors is an integer number (5425807950).

Almost surely, 2^21341511211 is an apocalyptic number.

21341511211 is a deficient number, since it is larger than the sum of its proper divisors (361720589).

21341511211 is an equidigital number, since it uses as much as digits as its factorization.

21341511211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361720588.

The product of its digits is 240, while the sum is 22.

The spelling of 21341511211 in words is "twenty-one billion, three hundred forty-one million, five hundred eleven thousand, two hundred eleven".