21210122211001 has 2 divisors, whose sum is σ = 21210122211002. Its totient is φ = 21210122211000.

The previous prime is 21210122210887. The next prime is 21210122211037. The reversal of 21210122211001 is 10011222101212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18161030003776 + 3049092207225 = 4261576^2 + 1746165^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210122211001 - 2²³ = 21210113822393 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210122211401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605061105500 + 10605061105501.

It is an arithmetic number, because the mean of its divisors is an integer number (10605061105501).

Almost surely, 2^{21210122211001} is an apocalyptic number.

It is an amenable number.

21210122211001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210122211001 is an equidigital number, since it uses as much as digits as its factorization.

21210122211001 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 21210122211001 its reverse (10011222101212), we get a palindrome (31221344312213).

The spelling of 21210122211001 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-two million, two hundred eleven thousand, one".