21112211101222 has 4 divisors (see below), whose sum is σ = 31668316651836. Its totient is φ = 10556105550610.

The previous prime is 21112211101207. The next prime is 21112211101277. The reversal of 21112211101222 is 22210111221112.

It is a happy number.

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

It is a super-2 number, since 2×21112211101222² (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 21112211101222.

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, 5278052775304 + ... + 5278052775307.

It is an arithmetic number, because the mean of its divisors is an integer number (7917079162959).

Almost surely, 2^{21112211101222} is an apocalyptic number.

21112211101222 is a deficient number, since it is larger than the sum of its proper divisors (10556105550614).

21112211101222 is a wasteful number, since it uses less digits than its factorization.

21112211101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556105550613.

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

Adding to 21112211101222 its reverse (22210111221112), we get a palindrome (43322322322334).

The spelling of 21112211101222 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred one thousand, two hundred twenty-two".