21212122012201 has 8 divisors (see below), whose sum is σ = 21548133656640. Its totient is φ = 20876681332848.

The previous prime is 21212122012199. The next prime is 21212122012219. The reversal of 21212122012201 is 10221022121212.

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 21212122012201 - 2¹ = 21212122012199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212122012231) 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, 142666381 + ... + 142814986.

It is an arithmetic number, because the mean of its divisors is an integer number (2693516707080).

Almost surely, 2^{21212122012201} is an apocalyptic number.

It is an amenable number.

21212122012201 is a deficient number, since it is larger than the sum of its proper divisors (336011644439).

21212122012201 is a wasteful number, since it uses less digits than its factorization.

21212122012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285482543.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21212122012201 its reverse (10221022121212), we get a palindrome (31433144133413).

The spelling of 21212122012201 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, twelve thousand, two hundred one".