221121021011 has 32 divisors (see below), whose sum is σ = 256229568000. Its totient is φ = 188590394880.

The previous prime is 221121020971. The next prime is 221121021029. The reversal of 221121021011 is 110120121122.

It is a de Polignac number, because none of the positive numbers 2^k-221121021011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221121021041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105344840 + ... + 105346938.

It is an arithmetic number, because the mean of its divisors is an integer number (8007174000).

Almost surely, 2^221121021011 is an apocalyptic number.

221121021011 is a deficient number, since it is larger than the sum of its proper divisors (35108546989).

221121021011 is a wasteful number, since it uses less digits than its factorization.

221121021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3659.

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

Adding to 221121021011 its reverse (110120121122), we get a palindrome (331241142133).

The spelling of 221121021011 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, eleven".