221340220431 has 16 divisors (see below), whose sum is σ = 325137034368. Its totient is φ = 132817412000.

The previous prime is 221340220427. The next prime is 221340220433. The reversal of 221340220431 is 134022043122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221340220431 - 2² = 221340220427 is a prime.

It is a super-2 number, since 2×221340220431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221340220433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33201021 + ... + 33207686.

It is an arithmetic number, because the mean of its divisors is an integer number (20321064648).

Almost surely, 2^221340220431 is an apocalyptic number.

221340220431 is a deficient number, since it is larger than the sum of its proper divisors (103796813937).

221340220431 is a wasteful number, since it uses less digits than its factorization.

221340220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66408822.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 221340220431 its reverse (134022043122), we get a palindrome (355362263553).

The spelling of 221340220431 in words is "two hundred twenty-one billion, three hundred forty million, two hundred twenty thousand, four hundred thirty-one".