21210211220201 has 2 divisors, whose sum is σ = 21210211220202. Its totient is φ = 21210211220200.

The previous prime is 21210211220101. The next prime is 21210211220243. The reversal of 21210211220201 is 10202211201212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19831702758400 + 1378508461801 = 4453280^2 + 1174099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210211220201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21210211220201.

It is not a weakly prime, because it can be changed into another prime (21210211220291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605105610100 + 10605105610101.

It is an arithmetic number, because the mean of its divisors is an integer number (10605105610101).

Almost surely, 2^{21210211220201} is an apocalyptic number.

It is an amenable number.

21210211220201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210211220201 is an equidigital number, since it uses as much as digits as its factorization.

21210211220201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210211220201 its reverse (10202211201212), we get a palindrome (31412422421413).

The spelling of 21210211220201 in words is "twenty-one trillion, two hundred ten billion, two hundred eleven million, two hundred twenty thousand, two hundred one".