221331132021 has 32 divisors (see below), whose sum is σ = 305353267200. Its totient is φ = 142536401280.

The previous prime is 221331132017. The next prime is 221331132059. The reversal of 221331132021 is 120231133122.

221331132021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221331132021 - 2² = 221331132017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221331134021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2912905 + ... + 2987921.

It is an arithmetic number, because the mean of its divisors is an integer number (9542289600).

Almost surely, 2^221331132021 is an apocalyptic number.

It is an amenable number.

221331132021 is a deficient number, since it is larger than the sum of its proper divisors (84022135179).

221331132021 is a wasteful number, since it uses less digits than its factorization.

221331132021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75369.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221331132021 its reverse (120231133122), we get a palindrome (341562265143).

The spelling of 221331132021 in words is "two hundred twenty-one billion, three hundred thirty-one million, one hundred thirty-two thousand, twenty-one".