21221211211122 has 64 divisors (see below), whose sum is σ = 46162342154880. Its totient is φ = 6464838127104.

The previous prime is 21221211211087. The next prime is 21221211211153. The reversal of 21221211211122 is 22111211212212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1430088 + ... + 6669900.

It is an arithmetic number, because the mean of its divisors is an integer number (721286596170).

Almost surely, 2^{21221211211122} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221211211122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23081171077440).

21221211211122 is an abundant number, since it is smaller than the sum of its proper divisors (24941130943758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221211211122 is a wasteful number, since it uses less digits than its factorization.

21221211211122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5240347.

The product of its digits is 128, while the sum is 21.

Adding to 21221211211122 its reverse (22111211212212), we get a palindrome (43332422423334).

The spelling of 21221211211122 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-two".