21220201019201 has 2 divisors, whose sum is σ = 21220201019202. Its totient is φ = 21220201019200.

The previous prime is 21220201019189. The next prime is 21220201019231. The reversal of 21220201019201 is 10291010202212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13205781568576 + 8014419450625 = 3633976^2 + 2830975^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220201019201 - 2³⁸ = 20945323112257 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220201019231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610100509600 + 10610100509601.

It is an arithmetic number, because the mean of its divisors is an integer number (10610100509601).

Almost surely, 2^{21220201019201} is an apocalyptic number.

It is an amenable number.

21220201019201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220201019201 is an equidigital number, since it uses as much as digits as its factorization.

21220201019201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 21220201019201 in words is "twenty-one trillion, two hundred twenty billion, two hundred one million, nineteen thousand, two hundred one".