221121012011201 has 4 divisors (see below), whose sum is σ = 221178490832832. Its totient is φ = 221063533189572.

The previous prime is 221121012011093. The next prime is 221121012011203. The reversal of 221121012011201 is 102110210121122.

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 a de Polignac number, because none of the positive numbers 2^k-221121012011201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221121012011201.

It is not an unprimeable number, because it can be changed into a prime (221121012011203) 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, 28739405045 + ... + 28739412738.

It is an arithmetic number, because the mean of its divisors is an integer number (55294622708208).

Almost surely, 2^{221121012011201} is an apocalyptic number.

It is an amenable number.

221121012011201 is a deficient number, since it is larger than the sum of its proper divisors (57478821631).

221121012011201 is an equidigital number, since it uses as much as digits as its factorization.

221121012011201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57478821630.

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

Adding to 221121012011201 its reverse (102110210121122), we get a palindrome (323231222132323).

The spelling of 221121012011201 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twelve million, eleven thousand, two hundred one".