21100121202222 has 48 divisors (see below), whose sum is σ = 46953512566272. Its totient is φ = 6843138171840.

The previous prime is 21100121202203. The next prime is 21100121202269. The reversal of 21100121202222 is 22220212100112.

It is a happy number.

21100121202222 is a `hidden beast` number, since 21 + 100 + 121 + 202 + 222 = 666.

It is a super-2 number, since 2×21100121202222² (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 = 21100121202195 and 21100121202204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33884563 + ... + 34501649.

It is an arithmetic number, because the mean of its divisors is an integer number (978198178464).

Almost surely, 2^{21100121202222} is an apocalyptic number.

21100121202222 is an abundant number, since it is smaller than the sum of its proper divisors (25853391364050).

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

21100121202222 is a wasteful number, since it uses less digits than its factorization.

21100121202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668473 (or 668470 counting only the distinct ones).

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

Adding to 21100121202222 its reverse (22220212100112), we get a palindrome (43320333302334).

The spelling of 21100121202222 in words is "twenty-one trillion, one hundred billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-two".