221232431012 has 24 divisors (see below), whose sum is σ = 391066363800. Its totient is φ = 109501607936.

The previous prime is 221232431011. The next prime is 221232431029. The reversal of 221232431012 is 210134232122.

It can be written as a sum of positive squares in 4 ways, for example, as 60997144576 + 160235286436 = 246976^2 + 400294^2 .

It is not an unprimeable number, because it can be changed into a prime (221232431011) 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, 63164 + ... + 668172.

It is an arithmetic number, because the mean of its divisors is an integer number (16294431825).

Almost surely, 2^221232431012 is an apocalyptic number.

It is an amenable number.

221232431012 is a deficient number, since it is larger than the sum of its proper divisors (169833932788).

221232431012 is a wasteful number, since it uses less digits than its factorization.

221232431012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605935 (or 605933 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 221232431012 its reverse (210134232122), we get a palindrome (431366663134).

The spelling of 221232431012 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thirty-one thousand, twelve".