21202021111101 has 16 divisors (see below), whose sum is σ = 28323196176768. Its totient is φ = 14107777689600.

The previous prime is 21202021111099. The next prime is 21202021111111. The reversal of 21202021111101 is 10111112020212.

It is a happy number.

It is not a de Polignac number, because 21202021111101 - 2¹ = 21202021111099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202021111111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4153161 + ... + 7723521.

It is an arithmetic number, because the mean of its divisors is an integer number (1770199761048).

Almost surely, 2^{21202021111101} is an apocalyptic number.

It is an amenable number.

21202021111101 is a deficient number, since it is larger than the sum of its proper divisors (7121175065667).

21202021111101 is a wasteful number, since it uses less digits than its factorization.

21202021111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574132.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21202021111101 its reverse (10111112020212), we get a palindrome (31313133131313).

The spelling of 21202021111101 in words is "twenty-one trillion, two hundred two billion, twenty-one million, one hundred eleven thousand, one hundred one".