21122011212201 has 20 divisors (see below), whose sum is σ = 31553447938452. Its totient is φ = 14080977577728.

The previous prime is 21122011212199. The next prime is 21122011212221. The reversal of 21122011212201 is 10221211022112.

21122011212201 is a `hidden beast` number, since 21 + 1 + 220 + 11 + 212 + 201 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12710822170176 + 8411189042025 = 3565224^2 + 2900205^2 .

It is not a de Polignac number, because 21122011212201 - 2¹ = 21122011212199 is a prime.

It is a super-2 number, since 2×21122011212201² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21122011212221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 185316 + ... + 6502181.

Almost surely, 2^{21122011212201} is an apocalyptic number.

It is an amenable number.

21122011212201 is a deficient number, since it is larger than the sum of its proper divisors (10431436726251).

21122011212201 is an equidigital number, since it uses as much as digits as its factorization.

21122011212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6726502 (or 6726493 counting only the distinct ones).

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

Adding to 21122011212201 its reverse (10221211022112), we get a palindrome (31343222234313).

The spelling of 21122011212201 in words is "twenty-one trillion, one hundred twenty-two billion, eleven million, two hundred twelve thousand, two hundred one".