21202111310101 has 4 divisors (see below), whose sum is σ = 21202179410412. Its totient is φ = 21202043209792.

The previous prime is 21202111310053. The next prime is 21202111310117. The reversal of 21202111310101 is 10101311120212.

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 2 ways, for example, as 136526555025 + 21065584755076 = 369495^2 + 4589726^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202111310101 - 2¹³ = 21202111301909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202111110101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33580996 + ... + 34206541.

It is an arithmetic number, because the mean of its divisors is an integer number (5300544852603).

Almost surely, 2^{21202111310101} is an apocalyptic number.

It is an amenable number.

21202111310101 is a deficient number, since it is larger than the sum of its proper divisors (68100311).

21202111310101 is an equidigital number, since it uses as much as digits as its factorization.

21202111310101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68100310.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21202111310101 its reverse (10101311120212), we get a palindrome (31303422430313).

The spelling of 21202111310101 in words is "twenty-one trillion, two hundred two billion, one hundred eleven million, three hundred ten thousand, one hundred one".