21211220211201 has 16 divisors (see below), whose sum is σ = 33272502292800. Its totient is φ = 13309000916544.

The previous prime is 21211220211193. The next prime is 21211220211217. The reversal of 21211220211201 is 10211202211212.

21211220211201 is a `hidden beast` number, since 2 + 1 + 211 + 220 + 211 + 20 + 1 = 666.

It is not a de Polignac number, because 21211220211201 - 2³ = 21211220211193 is a prime.

It is a super-3 number, since 3×21211220211201³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21211220211221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23105903911 + ... + 23105904828.

It is an arithmetic number, because the mean of its divisors is an integer number (2079531393300).

Almost surely, 2^{21211220211201} is an apocalyptic number.

It is an amenable number.

21211220211201 is a deficient number, since it is larger than the sum of its proper divisors (12061282081599).

21211220211201 is a wasteful number, since it uses less digits than its factorization.

21211220211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46211808765 (or 46211808759 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21211220211201 its reverse (10211202211212), we get a palindrome (31422422422413).

The spelling of 21211220211201 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty million, two hundred eleven thousand, two hundred one".