221440431011 has 2 divisors, whose sum is σ = 221440431012. Its totient is φ = 221440431010.

The previous prime is 221440430971. The next prime is 221440431031. The reversal of 221440431011 is 110134044122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221440431011 is a prime.

It is not a weakly prime, because it can be changed into another prime (221440431031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110720215505 + 110720215506.

It is an arithmetic number, because the mean of its divisors is an integer number (110720215506).

Almost surely, 2^221440431011 is an apocalyptic number.

221440431011 is a deficient number, since it is larger than the sum of its proper divisors (1).

221440431011 is an equidigital number, since it uses as much as digits as its factorization.

221440431011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221440431011 its reverse (110134044122), we get a palindrome (331574475133).

The spelling of 221440431011 in words is "two hundred twenty-one billion, four hundred forty million, four hundred thirty-one thousand, eleven".