21122112201101 has 4 divisors (see below), whose sum is σ = 21124677751932. Its totient is φ = 21119546650272.

The previous prime is 21122112201031. The next prime is 21122112201107. The reversal of 21122112201101 is 10110221122112.

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 6519090669001 + 14603021532100 = 2553251^2 + 3821390^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122112201101 - 2³⁸ = 20847234294157 is a prime.

It is a super-2 number, since 2×21122112201101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122112201101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122112201107) 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, 1282763066 + ... + 1282779531.

It is an arithmetic number, because the mean of its divisors is an integer number (5281169437983).

Almost surely, 2^{21122112201101} is an apocalyptic number.

It is an amenable number.

21122112201101 is a deficient number, since it is larger than the sum of its proper divisors (2565550831).

21122112201101 is an equidigital number, since it uses as much as digits as its factorization.

21122112201101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565550830.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21122112201101 its reverse (10110221122112), we get a palindrome (31232333323213).

The spelling of 21122112201101 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twelve million, two hundred one thousand, one hundred one".