21022221202122 has 16 divisors (see below), whose sum is σ = 48050791319232. Its totient is φ = 6006348914880.

The previous prime is 21022221202117. The next prime is 21022221202183. The reversal of 21022221202122 is 22120212222012.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 7 ways as a sum of consecutive naturals, for example, 250264538079 + ... + 250264538162.

It is an arithmetic number, because the mean of its divisors is an integer number (3003174457452).

Almost surely, 2^{21022221202122} is an apocalyptic number.

21022221202122 is an abundant number, since it is smaller than the sum of its proper divisors (27028570117110).

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

21022221202122 is a wasteful number, since it uses less digits than its factorization.

21022221202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500529076253.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21022221202122 its reverse (22120212222012), we get a palindrome (43142433424134).

The spelling of 21022221202122 in words is "twenty-one trillion, twenty-two billion, two hundred twenty-one million, two hundred two thousand, one hundred twenty-two".