21111220222201 has 4 divisors (see below), whose sum is σ = 21128369874304. Its totient is φ = 21094070570100.

The previous prime is 21111220222111. The next prime is 21111220222249. The reversal of 21111220222201 is 10222202211112.

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 21111220222201 - 2³¹ = 21109072738553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111220229201) 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 3 ways as a sum of consecutive naturals, for example, 8574824205 + ... + 8574826666.

It is an arithmetic number, because the mean of its divisors is an integer number (5282092468576).

Almost surely, 2^{21111220222201} is an apocalyptic number.

It is an amenable number.

21111220222201 is a deficient number, since it is larger than the sum of its proper divisors (17149652103).

21111220222201 is a wasteful number, since it uses less digits than its factorization.

21111220222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17149652102.

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

Adding to 21111220222201 its reverse (10222202211112), we get a palindrome (31333422433313).

The spelling of 21111220222201 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, two hundred twenty-two thousand, two hundred one".