21121200111222 has 64 divisors (see below), whose sum is σ = 49082937361920. Its totient is φ = 6719687488800.

The previous prime is 21121200111161. The next prime is 21121200111239. The reversal of 21121200111222 is 22211100212112.

21121200111222 is a `hidden beast` number, since 211 + 2 + 120 + 0 + 111 + 222 = 666.

It is a super-2 number, since 2×21121200111222² (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 = 21121200111195 and 21121200111204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17871904 + ... + 19017027.

It is an arithmetic number, because the mean of its divisors is an integer number (766920896280).

Almost surely, 2^{21121200111222} is an apocalyptic number.

21121200111222 is an abundant number, since it is smaller than the sum of its proper divisors (27961737250698).

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

21121200111222 is a wasteful number, since it uses less digits than its factorization.

21121200111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36889426 (or 36889420 counting only the distinct ones).

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

Adding to 21121200111222 its reverse (22211100212112), we get a palindrome (43332300323334).

The spelling of 21121200111222 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred million, one hundred eleven thousand, two hundred twenty-two".