21002221021011 has 4 divisors (see below), whose sum is σ = 28002961361352. Its totient is φ = 14001480680672.

The previous prime is 21002221021009. The next prime is 21002221021051. The reversal of 21002221021011 is 11012012220012.

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 21002221021011 - 2¹ = 21002221021009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002221021051) 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, 3500370170166 + ... + 3500370170171.

It is an arithmetic number, because the mean of its divisors is an integer number (7000740340338).

Almost surely, 2^{21002221021011} is an apocalyptic number.

21002221021011 is a deficient number, since it is larger than the sum of its proper divisors (7000740340341).

21002221021011 is an equidigital number, since it uses as much as digits as its factorization.

21002221021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000740340340.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002221021011 its reverse (11012012220012), we get a palindrome (32014233241023).

The spelling of 21002221021011 in words is "twenty-one trillion, two billion, two hundred twenty-one million, twenty-one thousand, eleven".