221220211011 has 4 divisors (see below), whose sum is σ = 294960281352. Its totient is φ = 147480140672.

The previous prime is 221220210983. The next prime is 221220211027. The reversal of 221220211011 is 110112022122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221220211011 - 2¹⁷ = 221220079939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221220211211) 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, 36870035166 + ... + 36870035171.

It is an arithmetic number, because the mean of its divisors is an integer number (73740070338).

Almost surely, 2^221220211011 is an apocalyptic number.

221220211011 is a deficient number, since it is larger than the sum of its proper divisors (73740070341).

221220211011 is an equidigital number, since it uses as much as digits as its factorization.

221220211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73740070340.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221220211011 its reverse (110112022122), we get a palindrome (331332233133).

The spelling of 221220211011 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, eleven".