21002221011101 has 4 divisors (see below), whose sum is σ = 22911513830304. Its totient is φ = 19092928191900.

The previous prime is 21002221011097. The next prime is 21002221011139. The reversal of 21002221011101 is 10111012220012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21002221011101 - 2² = 21002221011097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002221011901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 954646409585 + ... + 954646409606.

It is an arithmetic number, because the mean of its divisors is an integer number (5727878457576).

Almost surely, 2^{21002221011101} is an apocalyptic number.

It is an amenable number.

21002221011101 is a deficient number, since it is larger than the sum of its proper divisors (1909292819203).

21002221011101 is a wasteful number, since it uses less digits than its factorization.

21002221011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909292819202.

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

Adding to 21002221011101 its reverse (10111012220012), we get a palindrome (31113233231113).

The spelling of 21002221011101 in words is "twenty-one trillion, two billion, two hundred twenty-one million, eleven thousand, one hundred one".