21012111101222 has 16 divisors (see below), whose sum is σ = 33372425736000. Its totient is φ = 9887978421888.

The previous prime is 21012111101209. The next prime is 21012111101227. The reversal of 21012111101222 is 22210111121012.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21012111101222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012111101227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2452808 + ... + 6931124.

It is an arithmetic number, because the mean of its divisors is an integer number (2085776608500).

Almost surely, 2^{21012111101222} is an apocalyptic number.

21012111101222 is a deficient number, since it is larger than the sum of its proper divisors (12360314634778).

21012111101222 is a wasteful number, since it uses less digits than its factorization.

21012111101222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4616335.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21012111101222 its reverse (22210111121012), we get a palindrome (43222222222234).

The spelling of 21012111101222 in words is "twenty-one trillion, twelve billion, one hundred eleven million, one hundred one thousand, two hundred twenty-two".