21122102212201 has 4 divisors (see below), whose sum is σ = 21122139166852. Its totient is φ = 21122065257552.

The previous prime is 21122102212163. The next prime is 21122102212241. The reversal of 21122102212201 is 10221220122112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17026153628176 + 4095948584025 = 4126276^2 + 2023845^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122102212201 - 2⁷ = 21122102212073 is a prime.

It is a super-2 number, since 2×21122102212201² (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 (21122102212241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17606286 + ... + 18767671.

It is an arithmetic number, because the mean of its divisors is an integer number (5280534791713).

Almost surely, 2^{21122102212201} is an apocalyptic number.

It is an amenable number.

21122102212201 is a deficient number, since it is larger than the sum of its proper divisors (36954651).

21122102212201 is an equidigital number, since it uses as much as digits as its factorization.

21122102212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36954650.

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

Adding to 21122102212201 its reverse (10221220122112), we get a palindrome (31343322334313).

The spelling of 21122102212201 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred two million, two hundred twelve thousand, two hundred one".