21401332211 has 4 divisors (see below), whose sum is σ = 24458665392. Its totient is φ = 18343999032.

The previous prime is 21401332201. The next prime is 21401332219. The reversal of 21401332211 is 11223310412.

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-21401332211 is a prime.

It is a super-2 number, since 2×21401332211² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21401332219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528666580 + ... + 1528666593.

It is an arithmetic number, because the mean of its divisors is an integer number (6114666348).

Almost surely, 2^21401332211 is an apocalyptic number.

21401332211 is a deficient number, since it is larger than the sum of its proper divisors (3057333181).

21401332211 is an equidigital number, since it uses as much as digits as its factorization.

21401332211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057333180.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21401332211 its reverse (11223310412), we get a palindrome (32624642623).

The spelling of 21401332211 in words is "twenty-one billion, four hundred one million, three hundred thirty-two thousand, two hundred eleven".