21102201102011 has 4 divisors (see below), whose sum is σ = 21782917266624. Its totient is φ = 20421484937400.

The previous prime is 21102201102007. The next prime is 21102201102023. The reversal of 21102201102011 is 11020110220112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21102201102011 - 2² = 21102201102007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102201102061) 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, 340358082260 + ... + 340358082321.

It is an arithmetic number, because the mean of its divisors is an integer number (5445729316656).

Almost surely, 2^{21102201102011} is an apocalyptic number.

21102201102011 is a deficient number, since it is larger than the sum of its proper divisors (680716164613).

21102201102011 is an equidigital number, since it uses as much as digits as its factorization.

21102201102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680716164612.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21102201102011 its reverse (11020110220112), we get a palindrome (32122311322123).

The spelling of 21102201102011 in words is "twenty-one trillion, one hundred two billion, two hundred one million, one hundred two thousand, eleven".