21221111110122 has 48 divisors (see below), whose sum is σ = 57324559885632. Its totient is φ = 5511976911360.

The previous prime is 21221111110097. The next prime is 21221111110123. The reversal of 21221111110122 is 22101111112212.

It is a happy number.

21221111110122 is a `hidden beast` number, since 212 + 211 + 11 + 110 + 122 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21221111110095 and 21221111110104.

It is not an unprimeable number, because it can be changed into a prime (21221111110123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7655522103 + ... + 7655524874.

It is an arithmetic number, because the mean of its divisors is an integer number (1194261664284).

Almost surely, 2^{21221111110122} is an apocalyptic number.

21221111110122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221111110122 is an abundant number, since it is smaller than the sum of its proper divisors (36103448775510).

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

21221111110122 is a wasteful number, since it uses less digits than its factorization.

21221111110122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15311047003 (or 15311047000 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21221111110122 its reverse (22101111112212), we get a palindrome (43322222222334).

The spelling of 21221111110122 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, one hundred twenty-two".