21101020220122 has 4 divisors (see below), whose sum is σ = 31651530330186. Its totient is φ = 10550510110060.

The previous prime is 21101020220117. The next prime is 21101020220281. The reversal of 21101020220122 is 22102202010112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18855664820721 + 2245355399401 = 4342311^2 + 1498451^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21101020220096 and 21101020220105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275255055029 + ... + 5275255055032.

Almost surely, 2^{21101020220122} is an apocalyptic number.

21101020220122 is a deficient number, since it is larger than the sum of its proper divisors (10550510110064).

21101020220122 is a wasteful number, since it uses less digits than its factorization.

21101020220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550510110063.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21101020220122 its reverse (22102202010112), we get a palindrome (43203222230234).

The spelling of 21101020220122 in words is "twenty-one trillion, one hundred one billion, twenty million, two hundred twenty thousand, one hundred twenty-two".