21202123131211 has 8 divisors (see below), whose sum is σ = 23129720281584. Its totient is φ = 19274547882720.

The previous prime is 21202123131209. The next prime is 21202123131223. The reversal of 21202123131211 is 11213132120212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21202123131211 - 2¹ = 21202123131209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202123131281) 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, 3417736 + ... + 7354261.

It is an arithmetic number, because the mean of its divisors is an integer number (2891215035198).

Almost surely, 2^{21202123131211} is an apocalyptic number.

21202123131211 is a deficient number, since it is larger than the sum of its proper divisors (1927597150373).

21202123131211 is a wasteful number, since it uses less digits than its factorization.

21202123131211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950941.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21202123131211 its reverse (11213132120212), we get a palindrome (32415255251423).

The spelling of 21202123131211 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-three million, one hundred thirty-one thousand, two hundred eleven".