221102121021 has 8 divisors (see below), whose sum is σ = 294808874304. Its totient is φ = 147398390880.

The previous prime is 221102120983. The next prime is 221102121073. The reversal of 221102121021 is 120121201122.

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

It is not a de Polignac number, because 221102121021 - 2¹¹ = 221102118973 is a prime.

It is a super-2 number, since 2×221102121021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102121521) 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, 579241 + ... + 881886.

It is an arithmetic number, because the mean of its divisors is an integer number (36851109288).

Almost surely, 2^221102121021 is an apocalyptic number.

It is an amenable number.

221102121021 is a deficient number, since it is larger than the sum of its proper divisors (73706753283).

221102121021 is a wasteful number, since it uses less digits than its factorization.

221102121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511571.

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

Adding to 221102121021 its reverse (120121201122), we get a palindrome (341223322143).

The spelling of 221102121021 in words is "two hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand, twenty-one".