201111110001221 has 8 divisors (see below), whose sum is σ = 229857195600384. Its totient is φ = 172369006158960.

The previous prime is 201111110001149. The next prime is 201111110001233. The reversal of 201111110001221 is 122100011111102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201111110001221 - 2²² = 201111105806917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201111110001196 and 201111110001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111110000221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 995330990 + ... + 995533023.

It is an arithmetic number, because the mean of its divisors is an integer number (28732149450048).

Almost surely, 2^{201111110001221} is an apocalyptic number.

It is an amenable number.

201111110001221 is a deficient number, since it is larger than the sum of its proper divisors (28746085599163).

201111110001221 is a wasteful number, since it uses less digits than its factorization.

201111110001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990878451.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 201111110001221 its reverse (122100011111102), we get a palindrome (323211121112323).

The spelling of 201111110001221 in words is "two hundred one trillion, one hundred eleven billion, one hundred ten million, one thousand, two hundred twenty-one".