21211022411 has 4 divisors (see below), whose sum is σ = 21212560872. Its totient is φ = 21209483952.

The previous prime is 21211022407. The next prime is 21211022431. The reversal of 21211022411 is 11422011212.

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 21211022411 - 2² = 21211022407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211022411.

It is not an unprimeable number, because it can be changed into a prime (21211022431) 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, 748361 + ... + 776186.

It is an arithmetic number, because the mean of its divisors is an integer number (5303140218).

Almost surely, 2^21211022411 is an apocalyptic number.

21211022411 is a deficient number, since it is larger than the sum of its proper divisors (1538461).

21211022411 is a wasteful number, since it uses less digits than its factorization.

21211022411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538460.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21211022411 its reverse (11422011212), we get a palindrome (32633033623).

The spelling of 21211022411 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, four hundred eleven".