201220109949877 has 2 divisors, whose sum is σ = 201220109949878. Its totient is φ = 201220109949876.

The previous prime is 201220109949851. The next prime is 201220109950019. The reversal of 201220109949877 is 778949901022102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162081059983236 + 39139049966641 = 12731106^2 + 6256121^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220109949877 - 2³⁹ = 200670354135989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201220109940877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610054974938 + 100610054974939.

It is an arithmetic number, because the mean of its divisors is an integer number (100610054974939).

Almost surely, 2^{201220109949877} is an apocalyptic number.

It is an amenable number.

201220109949877 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220109949877 is an equidigital number, since it uses as much as digits as its factorization.

201220109949877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 61.

The spelling of 201220109949877 in words is "two hundred one trillion, two hundred twenty billion, one hundred nine million, nine hundred forty-nine thousand, eight hundred seventy-seven".