21121100202222 has 24 divisors (see below), whose sum is σ = 46999204955976. Its totient is φ = 6850086551856.

The previous prime is 21121100202217. The next prime is 21121100202247. The reversal of 21121100202222 is 22220200112112.

It is a happy number.

21121100202222 is a `hidden beast` number, since 21 + 121 + 100 + 202 + 222 = 666.

It is a super-2 number, since 2×21121100202222² (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 = 21121100202195 and 21121100202204.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 15856681168 + ... + 15856682499.

It is an arithmetic number, because the mean of its divisors is an integer number (1958300206499).

Almost surely, 2^{21121100202222} is an apocalyptic number.

21121100202222 is an abundant number, since it is smaller than the sum of its proper divisors (25878104753754).

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

21121100202222 is a wasteful number, since it uses less digits than its factorization.

21121100202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31713363712 (or 31713363709 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21121100202222 its reverse (22220200112112), we get a palindrome (43341300314334).

The spelling of 21121100202222 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, two hundred two thousand, two hundred twenty-two".