21101201220222 has 24 divisors (see below), whose sum is σ = 47707063629264. Its totient is φ = 6727919229504.

The previous prime is 21101201220221. The next prime is 21101201220247. The reversal of 21101201220222 is 22202210210112.

It is a happy number.

21101201220222 is a `hidden beast` number, since 21 + 1 + 0 + 1 + 201 + 220 + 222 = 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 = 21101201220195 and 21101201220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101201220221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25484542123 + ... + 25484542950.

It is an arithmetic number, because the mean of its divisors is an integer number (1987794317886).

Almost surely, 2^{21101201220222} is an apocalyptic number.

21101201220222 is an abundant number, since it is smaller than the sum of its proper divisors (26605862409042).

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

21101201220222 is a wasteful number, since it uses less digits than its factorization.

21101201220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50969085104 (or 50969085101 counting only the distinct ones).

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

Adding to 21101201220222 its reverse (22202210210112), we get a palindrome (43303411430334).

The spelling of 21101201220222 in words is "twenty-one trillion, one hundred one billion, two hundred one million, two hundred twenty thousand, two hundred twenty-two".