21202101220122 has 48 divisors (see below), whose sum is σ = 47241448241832. Its totient is φ = 6867321039360.

The previous prime is 21202101220061. The next prime is 21202101220211. The reversal of 21202101220122 is 22102210120212.

It is a happy number.

21202101220122 is a `hidden beast` number, since 21 + 202 + 101 + 220 + 122 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15158867246721 + 6043233973401 = 3893439^2 + 2458299^2 .

It is a super-2 number, since 2×21202101220122² (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 = 21202101220095 and 21202101220104.

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, 20409723 + ... + 21423374.

Almost surely, 2^{21202101220122} is an apocalyptic number.

21202101220122 is an abundant number, since it is smaller than the sum of its proper divisors (26039347021710).

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

21202101220122 is a wasteful number, since it uses less digits than its factorization.

21202101220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41833903 (or 41833900 counting only the distinct ones).

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

Adding to 21202101220122 its reverse (22102210120212), we get a palindrome (43304311340334).

The spelling of 21202101220122 in words is "twenty-one trillion, two hundred two billion, one hundred one million, two hundred twenty thousand, one hundred twenty-two".