221121221211021 has 8 divisors (see below), whose sum is σ = 294841104193984. Its totient is φ = 147407742851040.

The previous prime is 221121221211013. The next prime is 221121221211043. The reversal of 221121221211021 is 120112122121122.

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

It is not a de Polignac number, because 221121221211021 - 2³ = 221121221211013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121221211001) 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, 1601075185 + ... + 1601213286.

It is an arithmetic number, because the mean of its divisors is an integer number (36855138024248).

Almost surely, 2^{221121221211021} is an apocalyptic number.

It is an amenable number.

221121221211021 is a deficient number, since it is larger than the sum of its proper divisors (73719882982963).

221121221211021 is a wasteful number, since it uses less digits than its factorization.

221121221211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202311491.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221121221211021 its reverse (120112122121122), we get a palindrome (341233343332143).

The spelling of 221121221211021 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, twenty-one".