21211322012201 has 4 divisors (see below), whose sum is σ = 21417257177472. Its totient is φ = 21005386846932.

The previous prime is 21211322012191. The next prime is 21211322012207. The reversal of 21211322012201 is 10221022311212.

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 21211322012201 - 2¹⁰ = 21211322011177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211322012207) 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, 102967582481 + ... + 102967582686.

It is an arithmetic number, because the mean of its divisors is an integer number (5354314294368).

Almost surely, 2^{21211322012201} is an apocalyptic number.

It is an amenable number.

21211322012201 is a deficient number, since it is larger than the sum of its proper divisors (205935165271).

21211322012201 is a wasteful number, since it uses less digits than its factorization.

21211322012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205935165270.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21211322012201 its reverse (10221022311212), we get a palindrome (31432344323413).

The spelling of 21211322012201 in words is "twenty-one trillion, two hundred eleven billion, three hundred twenty-two million, twelve thousand, two hundred one".