21211113122 has 4 divisors (see below), whose sum is σ = 31816669686. Its totient is φ = 10605556560.

The previous prime is 21211113109. The next prime is 21211113149. The reversal of 21211113122 is 22131111212.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 19650152041 + 1560961081 = 140179^2 + 39509^2 .

It is a super-2 number, since 2×21211113122² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21211113122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302778279 + ... + 5302778282.

Almost surely, 2^21211113122 is an apocalyptic number.

21211113122 is a deficient number, since it is larger than the sum of its proper divisors (10605556564).

21211113122 is a wasteful number, since it uses less digits than its factorization.

21211113122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605556563.

The product of its digits is 48, while the sum is 17.

Adding to 21211113122 its reverse (22131111212), we get a palindrome (43342224334).

The spelling of 21211113122 in words is "twenty-one billion, two hundred eleven million, one hundred thirteen thousand, one hundred twenty-two".