21121211202201 has 24 divisors (see below), whose sum is σ = 34393891525280. Its totient is φ = 12800734059960.

The previous prime is 21121211202193. The next prime is 21121211202229. The reversal of 21121211202201 is 10220211212112.

21121211202201 is a `hidden beast` number, since 211 + 2 + 1 + 211 + 20 + 220 + 1 = 666.

It is not a de Polignac number, because 21121211202201 - 2³ = 21121211202193 is a prime.

It is a super-2 number, since 2×21121211202201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121211202271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3232505335 + ... + 3232511868.

Almost surely, 2^{21121211202201} is an apocalyptic number.

It is an amenable number.

21121211202201 is a deficient number, since it is larger than the sum of its proper divisors (13272680323079).

21121211202201 is a wasteful number, since it uses less digits than its factorization.

21121211202201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6465017234 (or 6465017217 counting only the distinct ones).

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

Adding to 21121211202201 its reverse (10220211212112), we get a palindrome (31341422414313).

The spelling of 21121211202201 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, two hundred two thousand, two hundred one".