21202011020122 has 4 divisors (see below), whose sum is σ = 31803016530186. Its totient is φ = 10601005510060.

The previous prime is 21202011020119. The next prime is 21202011020167. The reversal of 21202011020122 is 22102011020212.

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., 20829265360281 + 372745659841 = 4563909^2 + 610529^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21202011020096 and 21202011020105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300502755029 + ... + 5300502755032.

Almost surely, 2^{21202011020122} is an apocalyptic number.

21202011020122 is a deficient number, since it is larger than the sum of its proper divisors (10601005510064).

21202011020122 is a wasteful number, since it uses less digits than its factorization.

21202011020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601005510063.

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

Adding to 21202011020122 its reverse (22102011020212), we get a palindrome (43304022040334).

The spelling of 21202011020122 in words is "twenty-one trillion, two hundred two billion, eleven million, twenty thousand, one hundred twenty-two".