221221414330431 has 4 divisors (see below), whose sum is σ = 294961885773912. Its totient is φ = 147480942886952.

The previous prime is 221221414330333. The next prime is 221221414330457. The reversal of 221221414330431 is 134033414122122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221221414330431 is a prime.

It is a super-2 number, since 2×221221414330431² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221221414330392 and 221221414330401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221414830431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36870235721736 + ... + 36870235721741.

It is an arithmetic number, because the mean of its divisors is an integer number (73740471443478).

Almost surely, 2^{221221414330431} is an apocalyptic number.

221221414330431 is a deficient number, since it is larger than the sum of its proper divisors (73740471443481).

221221414330431 is an equidigital number, since it uses as much as digits as its factorization.

221221414330431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73740471443480.

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 221221414330431 its reverse (134033414122122), we get a palindrome (355254828452553).

The spelling of 221221414330431 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, four hundred fourteen million, three hundred thirty thousand, four hundred thirty-one".