21011122222201 has 4 divisors (see below), whose sum is σ = 21171512468304. Its totient is φ = 20850731976100.

The previous prime is 21011122222199. The next prime is 21011122222213. The reversal of 21011122222201 is 10222222111012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21011122222201 - 2¹ = 21011122222199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011122222261) 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, 80195122855 + ... + 80195123116.

It is an arithmetic number, because the mean of its divisors is an integer number (5292878117076).

Almost surely, 2^{21011122222201} is an apocalyptic number.

It is an amenable number.

21011122222201 is a deficient number, since it is larger than the sum of its proper divisors (160390246103).

21011122222201 is a wasteful number, since it uses less digits than its factorization.

21011122222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160390246102.

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

Adding to 21011122222201 its reverse (10222222111012), we get a palindrome (31233344333213).

The spelling of 21011122222201 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred one".