221121020111 has 8 divisors (see below), whose sum is σ = 224998278960. Its totient is φ = 217260730368.

The previous prime is 221121020089. The next prime is 221121020129. The reversal of 221121020111 is 111020121122.

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 221121020111 - 2³⁴ = 203941150927 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 (221121020171) 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, 4215986 + ... + 4268111.

It is an arithmetic number, because the mean of its divisors is an integer number (28124784870).

Almost surely, 2^221121020111 is an apocalyptic number.

221121020111 is a deficient number, since it is larger than the sum of its proper divisors (3877258849).

221121020111 is an equidigital number, since it uses as much as digits as its factorization.

221121020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484553.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221121020111 its reverse (111020121122), we get a palindrome (332141141233).

The spelling of 221121020111 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty thousand, one hundred eleven".