221421323012 has 18 divisors (see below), whose sum is σ = 405067083918. Its totient is φ = 105897153472.

The previous prime is 221421322987. The next prime is 221421323029. The reversal of 221421323012 is 210323124122.

It can be written as a sum of positive squares in only one way, i.e., 220321339456 + 1099983556 = 469384^2 + 33166^2 .

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52318613 + ... + 52322844.

Almost surely, 2^221421323012 is an apocalyptic number.

It is an amenable number.

221421323012 is a deficient number, since it is larger than the sum of its proper divisors (183645760906).

221421323012 is a wasteful number, since it uses less digits than its factorization.

221421323012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104641507 (or 104641482 counting only the distinct ones).

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

Adding to 221421323012 its reverse (210323124122), we get a palindrome (431744447134).

The spelling of 221421323012 in words is "two hundred twenty-one billion, four hundred twenty-one million, three hundred twenty-three thousand, twelve".