221232413421 has 24 divisors (see below), whose sum is σ = 329989476960. Its totient is φ = 142736652576.

The previous prime is 221232413371. The next prime is 221232413431. The reversal of 221232413421 is 124314232122.

221232413421 is a `hidden beast` number, since 2 + 2 + 1 + 232 + 4 + 1 + 3 + 421 = 666.

It is not a de Polignac number, because 221232413421 - 2⁶ = 221232413357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221232413431) 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, 2580111 + ... + 2664476.

It is an arithmetic number, because the mean of its divisors is an integer number (13749561540).

Almost surely, 2^221232413421 is an apocalyptic number.

It is an amenable number.

221232413421 is a deficient number, since it is larger than the sum of its proper divisors (108757063539).

221232413421 is a wasteful number, since it uses less digits than its factorization.

221232413421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244745 (or 5244742 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 221232413421 its reverse (124314232122), we get a palindrome (345546645543).

The spelling of 221232413421 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thirteen thousand, four hundred twenty-one".