21202110011111 has 8 divisors (see below), whose sum is σ = 21210616018944. Its totient is φ = 21193605686680.

The previous prime is 21202110011053. The next prime is 21202110011129. The reversal of 21202110011111 is 11111001120212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202110011111 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 (21202110011711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25082786 + ... + 25914288.

It is an arithmetic number, because the mean of its divisors is an integer number (2651327002368).

Almost surely, 2^{21202110011111} is an apocalyptic number.

21202110011111 is a deficient number, since it is larger than the sum of its proper divisors (8506007833).

21202110011111 is an equidigital number, since it uses as much as digits as its factorization.

21202110011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841701.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21202110011111 its reverse (11111001120212), we get a palindrome (32313111131323).

The spelling of 21202110011111 in words is "twenty-one trillion, two hundred two billion, one hundred ten million, eleven thousand, one hundred eleven".