21201210222011 has 4 divisors (see below), whose sum is σ = 21207817021800. Its totient is φ = 21194603422224.

The previous prime is 21201210222007. The next prime is 21201210222043. The reversal of 21201210222011 is 11022201210212.

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 21201210222011 - 2² = 21201210222007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201210224011) 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, 3303395081 + ... + 3303401498.

It is an arithmetic number, because the mean of its divisors is an integer number (5301954255450).

Almost surely, 2^{21201210222011} is an apocalyptic number.

21201210222011 is a deficient number, since it is larger than the sum of its proper divisors (6606799789).

21201210222011 is an equidigital number, since it uses as much as digits as its factorization.

21201210222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6606799788.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21201210222011 its reverse (11022201210212), we get a palindrome (32223411432223).

The spelling of 21201210222011 in words is "twenty-one trillion, two hundred one billion, two hundred ten million, two hundred twenty-two thousand, eleven".