1011111200221 has 4 divisors (see below), whose sum is σ = 1064327579200. Its totient is φ = 957894821244.

The previous prime is 1011111200189. The next prime is 1011111200243. The reversal of 1011111200221 is 1220021111101.

It is a happy number.

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 1011111200221 - 2⁵ = 1011111200189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011111200621) 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, 26608189461 + ... + 26608189498.

It is an arithmetic number, because the mean of its divisors is an integer number (266081894800).

Almost surely, 2^{1011111200221} is an apocalyptic number.

It is an amenable number.

1011111200221 is a deficient number, since it is larger than the sum of its proper divisors (53216378979).

1011111200221 is an equidigital number, since it uses as much as digits as its factorization.

1011111200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53216378978.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1011111200221 its reverse (1220021111101), we get a palindrome (2231132311322).

The spelling of 1011111200221 in words is "one trillion, eleven billion, one hundred eleven million, two hundred thousand, two hundred twenty-one".