221220121011 has 8 divisors (see below), whose sum is σ = 301819700160. Its totient is φ = 144050311272.

The previous prime is 221220121009. The next prime is 221220121027. The reversal of 221220121011 is 110121022122.

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

It is not a de Polignac number, because 221220121011 - 2¹ = 221220121009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221220121061) 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, 857442201 + ... + 857442458.

It is an arithmetic number, because the mean of its divisors is an integer number (37727462520).

Almost surely, 2^221220121011 is an apocalyptic number.

221220121011 is a deficient number, since it is larger than the sum of its proper divisors (80599579149).

221220121011 is a wasteful number, since it uses less digits than its factorization.

221220121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714884705.

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

Adding to 221220121011 its reverse (110121022122), we get a palindrome (331341143133).

The spelling of 221220121011 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, eleven".