221021310001 has 2 divisors, whose sum is σ = 221021310002. Its totient is φ = 221021310000.

The previous prime is 221021309981. The next prime is 221021310031. The reversal of 221021310001 is 100013120122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211026309376 + 9995000625 = 459376^2 + 99975^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021310001 - 2⁵ = 221021309969 is a prime.

It is not a weakly prime, because it can be changed into another prime (221021310031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510655000 + 110510655001.

It is an arithmetic number, because the mean of its divisors is an integer number (110510655001).

Almost surely, 2^221021310001 is an apocalyptic number.

It is an amenable number.

221021310001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021310001 is an equidigital number, since it uses as much as digits as its factorization.

221021310001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 221021310001 its reverse (100013120122), we get a palindrome (321034430123).

The spelling of 221021310001 in words is "two hundred twenty-one billion, twenty-one million, three hundred ten thousand, one".