21142223211 has 4 divisors (see below), whose sum is σ = 28189630952. Its totient is φ = 14094815472.

The previous prime is 21142223131. The next prime is 21142223261. The reversal of 21142223211 is 11232224112.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21142223211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142223261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3523703866 + ... + 3523703871.

It is an arithmetic number, because the mean of its divisors is an integer number (7047407738).

Almost surely, 2^21142223211 is an apocalyptic number.

21142223211 is a deficient number, since it is larger than the sum of its proper divisors (7047407741).

21142223211 is an equidigital number, since it uses as much as digits as its factorization.

21142223211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047407740.

The product of its digits is 384, while the sum is 21.

Adding to 21142223211 its reverse (11232224112), we get a palindrome (32374447323).

Subtracting from 21142223211 its reverse (11232224112), we obtain a palindrome (9909999099).

The spelling of 21142223211 in words is "twenty-one billion, one hundred forty-two million, two hundred twenty-three thousand, two hundred eleven".