221012020111 has 4 divisors (see below), whose sum is σ = 221012982424. Its totient is φ = 221011057800.

The previous prime is 221012020051. The next prime is 221012020171. The reversal of 221012020111 is 111020210122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (221012020051) and next prime (221012020171).

It is a cyclic number.

It is not a de Polignac number, because 221012020111 - 2²³ = 221003631503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221012020091 and 221012020100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012020171) 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, 86881 + ... + 670501.

It is an arithmetic number, because the mean of its divisors is an integer number (55253245606).

Almost surely, 2^221012020111 is an apocalyptic number.

221012020111 is a deficient number, since it is larger than the sum of its proper divisors (962313).

221012020111 is an equidigital number, since it uses as much as digits as its factorization.

221012020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962312.

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

Adding to 221012020111 its reverse (111020210122), we get a palindrome (332032230233).

The spelling of 221012020111 in words is "two hundred twenty-one billion, twelve million, twenty thousand, one hundred eleven".