21122111101222 has 4 divisors (see below), whose sum is σ = 31683166651836. Its totient is φ = 10561055550610.

The previous prime is 21122111101187. The next prime is 21122111101249. The reversal of 21122111101222 is 22210111122112.

It is a happy number.

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

It is a super-2 number, since 2×21122111101222² (a number of 27 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 21122111101222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280527775304 + ... + 5280527775307.

It is an arithmetic number, because the mean of its divisors is an integer number (7920791662959).

Almost surely, 2^{21122111101222} is an apocalyptic number.

21122111101222 is a deficient number, since it is larger than the sum of its proper divisors (10561055550614).

21122111101222 is a wasteful number, since it uses less digits than its factorization.

21122111101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561055550613.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21122111101222 its reverse (22210111122112), we get a palindrome (43332222223334).

The spelling of 21122111101222 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred eleven million, one hundred one thousand, two hundred twenty-two".