21011211221122 has 16 divisors (see below), whose sum is σ = 31523367028032. Its totient is φ = 10503422447760.

The previous prime is 21011211221071. The next prime is 21011211221153. The reversal of 21011211221122 is 22112211211012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21011211221122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217700308 + ... + 217796800.

It is an arithmetic number, because the mean of its divisors is an integer number (1970210439252).

Almost surely, 2^{21011211221122} is an apocalyptic number.

21011211221122 is a deficient number, since it is larger than the sum of its proper divisors (10512155806910).

21011211221122 is a wasteful number, since it uses less digits than its factorization.

21011211221122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117993.

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

Adding to 21011211221122 its reverse (22112211211012), we get a palindrome (43123422432134).

It can be divided in two parts, 2101121122 and 1122, that added together give a square (2101122244 = 45838²).

The spelling of 21011211221122 in words is "twenty-one trillion, eleven billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-two".