21210122200122 has 96 divisors (see below), whose sum is σ = 50388180258240. Its totient is φ = 6611772061440.

The previous prime is 21210122200097. The next prime is 21210122200123. The reversal of 21210122200122 is 22100222101212.

It is a happy number.

21210122200122 is a `hidden beast` number, since 212 + 10 + 122 + 200 + 122 = 666.

It is a super-3 number, since 3×21210122200122³ (a number of 41 digits) contains 333 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 = 21210122200095 and 21210122200104.

It is not an unprimeable number, because it can be changed into a prime (21210122200123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1878204 + ... + 6778487.

It is an arithmetic number, because the mean of its divisors is an integer number (524876877690).

Almost surely, 2^{21210122200122} is an apocalyptic number.

21210122200122 is an abundant number, since it is smaller than the sum of its proper divisors (29178058058118).

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

21210122200122 is a wasteful number, since it uses less digits than its factorization.

21210122200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8656893 (or 8656870 counting only the distinct ones).

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

Adding to 21210122200122 its reverse (22100222101212), we get a palindrome (43310344301334).

The spelling of 21210122200122 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, two hundred thousand, one hundred twenty-two".