221021211210001 has 2 divisors, whose sum is σ = 221021211210002. Its totient is φ = 221021211210000.

The previous prime is 221021211209989. The next prime is 221021211210011. The reversal of 221021211210001 is 100012112120122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182160263048976 + 38860948161025 = 13496676^2 + 6233855^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021211210001 - 2⁷ = 221021211209873 is a prime.

It is not a weakly prime, because it can be changed into another prime (221021211210011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510605605000 + 110510605605001.

It is an arithmetic number, because the mean of its divisors is an integer number (110510605605001).

Almost surely, 2^{221021211210001} is an apocalyptic number.

It is an amenable number.

221021211210001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021211210001 is an equidigital number, since it uses as much as digits as its factorization.

221021211210001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221021211210001 its reverse (100012112120122), we get a palindrome (321033323330123).

The spelling of 221021211210001 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred eleven million, two hundred ten thousand, one".