221221011011021 has 24 divisors (see below), whose sum is σ = 257484728124000. Its totient is φ = 189510444722592.

The previous prime is 221221011010973. The next prime is 221221011011059. The reversal of 221221011011021 is 120110110122122.

It is not a de Polignac number, because 221221011011021 - 2¹⁰ = 221221011009997 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 (221221011016021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1357877450 + ... + 1358040356.

It is an arithmetic number, because the mean of its divisors is an integer number (10728530338500).

Almost surely, 2^{221221011011021} is an apocalyptic number.

It is an amenable number.

221221011011021 is a deficient number, since it is larger than the sum of its proper divisors (36263717112979).

221221011011021 is a wasteful number, since it uses less digits than its factorization.

221221011011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178473 (or 178466 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221221011011021 its reverse (120110110122122), we get a palindrome (341331121133143).

The spelling of 221221011011021 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, eleven million, eleven thousand, twenty-one".