21201020111022 has 32 divisors (see below), whose sum is σ = 44666046741120. Its totient is φ = 6690210953760.

The previous prime is 21201020110999. The next prime is 21201020111039. The reversal of 21201020111022 is 22011102010212.

It is a junction number, because it is equal to n+sod(n) for n = 21201020110992 and 21201020111010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67175608 + ... + 67490475.

It is an arithmetic number, because the mean of its divisors is an integer number (1395813960660).

Almost surely, 2^{21201020111022} is an apocalyptic number.

21201020111022 is an abundant number, since it is smaller than the sum of its proper divisors (23465026630098).

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

21201020111022 is a wasteful number, since it uses less digits than its factorization.

21201020111022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134667488.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21201020111022 its reverse (22011102010212), we get a palindrome (43212122121234).

The spelling of 21201020111022 in words is "twenty-one trillion, two hundred one billion, twenty million, one hundred eleven thousand, twenty-two".