21211211122 has 4 divisors (see below), whose sum is σ = 31816816686. Its totient is φ = 10605605560.

The previous prime is 21211211111. The next prime is 21211211123. The reversal of 21211211122 is 22111211212.

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., 14513261841 + 6697949281 = 120471^2 + 81841^2 .

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21211211096 and 21211211105.

It is not an unprimeable number, because it can be changed into a prime (21211211123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302802779 + ... + 5302802782.

Almost surely, 2^21211211122 is an apocalyptic number.

21211211122 is a deficient number, since it is larger than the sum of its proper divisors (10605605564).

21211211122 is a wasteful number, since it uses less digits than its factorization.

21211211122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10605605563.

The product of its digits is 32, while the sum is 16.

Adding to 21211211122 its reverse (22111211212), we get a palindrome (43322422334).

The spelling of 21211211122 in words is "twenty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-two".