221232400001 has 2 divisors, whose sum is σ = 221232400002. Its totient is φ = 221232400000.

The previous prime is 221232399991. The next prime is 221232400009. The reversal of 221232400001 is 100004232122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119024310001 + 102208090000 = 344999^2 + 319700^2 .

It is a cyclic number.

It is not a de Polignac number, because 221232400001 - 2³⁰ = 220158658177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221232400009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110616200000 + 110616200001.

It is an arithmetic number, because the mean of its divisors is an integer number (110616200001).

Almost surely, 2^221232400001 is an apocalyptic number.

It is an amenable number.

221232400001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221232400001 is an equidigital number, since it uses as much as digits as its factorization.

221232400001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 221232400001 its reverse (100004232122), we get a palindrome (321236632123).

The spelling of 221232400001 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thousand, one".