21101112201222 has 24 divisors (see below), whose sum is σ = 45720060422400. Its totient is φ = 7033552684560.

The previous prime is 21101112201181. The next prime is 21101112201233. The reversal of 21101112201222 is 22210221110112.

21101112201222 is a `hidden beast` number, since 2 + 110 + 111 + 220 + 1 + 222 = 666.

It is a super-2 number, since 2×21101112201222² (a number of 27 digits) contains 22 as substring.

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 = 21101112201195 and 21101112201204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11754054 + ... + 13429817.

It is an arithmetic number, because the mean of its divisors is an integer number (1905002517600).

Almost surely, 2^{21101112201222} is an apocalyptic number.

21101112201222 is an abundant number, since it is smaller than the sum of its proper divisors (24618948221178).

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

21101112201222 is a wasteful number, since it uses less digits than its factorization.

21101112201222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25230428 (or 25230425 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21101112201222 its reverse (22210221110112), we get a palindrome (43311333311334).

The spelling of 21101112201222 in words is "twenty-one trillion, one hundred one billion, one hundred twelve million, two hundred one thousand, two hundred twenty-two".