21211221000201 has 32 divisors (see below), whose sum is σ = 28990192450560. Its totient is φ = 13787702712000.

The previous prime is 21211221000199. The next prime is 21211221000223. The reversal of 21211221000201 is 10200012211212.

It is not a de Polignac number, because 21211221000201 - 2¹ = 21211221000199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211221000601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243145771 + ... + 243232991.

It is an arithmetic number, because the mean of its divisors is an integer number (905943514080).

Almost surely, 2^{21211221000201} is an apocalyptic number.

It is an amenable number.

21211221000201 is a deficient number, since it is larger than the sum of its proper divisors (7778971450359).

21211221000201 is a wasteful number, since it uses less digits than its factorization.

21211221000201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90557.

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

Adding to 21211221000201 its reverse (10200012211212), we get a palindrome (31411233211413).

The spelling of 21211221000201 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred one", and thus it is an aban number.