221333230321021 has 12 divisors (see below), whose sum is σ = 277274596227132. Its totient is φ = 175120797616128.

The previous prime is 221333230320973. The next prime is 221333230321171. The reversal of 221333230321021 is 120123032333122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 116597041556121 + 104736188764900 = 10798011^2 + 10234070^2 .

It is not a de Polignac number, because 221333230321021 - 2³³ = 221324640386429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221333230321921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173730949380 + ... + 173730950653.

It is an arithmetic number, because the mean of its divisors is an integer number (23106216352261).

Almost surely, 2^{221333230321021} is an apocalyptic number.

It is an amenable number.

221333230321021 is a deficient number, since it is larger than the sum of its proper divisors (55941365906111).

221333230321021 is a wasteful number, since it uses less digits than its factorization.

221333230321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347461900060 (or 347461900053 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 221333230321021 its reverse (120123032333122), we get a palindrome (341456262654143).

The spelling of 221333230321021 in words is "two hundred twenty-one trillion, three hundred thirty-three billion, two hundred thirty million, three hundred twenty-one thousand, twenty-one".