221020120111 has 8 divisors (see below), whose sum is σ = 252597479040. Its totient is φ = 189443525208.

The previous prime is 221020120067. The next prime is 221020120151. The reversal of 221020120111 is 111021020122.

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

It is not a de Polignac number, because 221020120111 - 2⁹ = 221020119599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020120091 and 221020120100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020120151) 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, 716100 + ... + 977158.

It is an arithmetic number, because the mean of its divisors is an integer number (31574684880).

Almost surely, 2^221020120111 is an apocalyptic number.

221020120111 is a deficient number, since it is larger than the sum of its proper divisors (31577358929).

221020120111 is a wasteful number, since it uses less digits than its factorization.

221020120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382013.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221020120111 its reverse (111021020122), we get a palindrome (332041140233).

The spelling of 221020120111 in words is "two hundred twenty-one billion, twenty million, one hundred twenty thousand, one hundred eleven".