221440212001 has 2 divisors, whose sum is σ = 221440212002. Its totient is φ = 221440212000.

The previous prime is 221440211999. The next prime is 221440212079. The reversal of 221440212001 is 100212044122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140670003600 + 80770208401 = 375060^2 + 284201^2 .

It is a cyclic number.

It is not a de Polignac number, because 221440212001 - 2¹ = 221440211999 is a prime.

Together with 221440211999, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221440212001.

It is not a weakly prime, because it can be changed into another prime (221440212601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110720106000 + 110720106001.

It is an arithmetic number, because the mean of its divisors is an integer number (110720106001).

Almost surely, 2^221440212001 is an apocalyptic number.

It is an amenable number.

221440212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221440212001 is an equidigital number, since it uses as much as digits as its factorization.

221440212001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221440212001 its reverse (100212044122), we get a palindrome (321652256123).

The spelling of 221440212001 in words is "two hundred twenty-one billion, four hundred forty million, two hundred twelve thousand, one".