1220200210261 has 2 divisors, whose sum is σ = 1220200210262. Its totient is φ = 1220200210260.

The previous prime is 1220200210213. The next prime is 1220200210291. The reversal of 1220200210261 is 1620120020221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 947324569636 + 272875640625 = 973306^2 + 522375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220200210261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220200210291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610100105130 + 610100105131.

It is an arithmetic number, because the mean of its divisors is an integer number (610100105131).

Almost surely, 2^{1220200210261} is an apocalyptic number.

It is an amenable number.

1220200210261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220200210261 is an equidigital number, since it uses as much as digits as its factorization.

1220200210261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1220200210261 its reverse (1620120020221), we get a palindrome (2840320230482).

The spelling of 1220200210261 in words is "one trillion, two hundred twenty billion, two hundred million, two hundred ten thousand, two hundred sixty-one".