1220211099977 has 2 divisors, whose sum is σ = 1220211099978. Its totient is φ = 1220211099976.

The previous prime is 1220211099893. The next prime is 1220211100051. The reversal of 1220211099977 is 7799901120221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792489867961 + 427721232016 = 890219^2 + 654004^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220211099977 - 2³⁸ = 945333193033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220211099077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105549988 + 610105549989.

It is an arithmetic number, because the mean of its divisors is an integer number (610105549989).

Almost surely, 2^{1220211099977} is an apocalyptic number.

It is an amenable number.

1220211099977 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220211099977 is an equidigital number, since it uses as much as digits as its factorization.

1220211099977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 50.

The spelling of 1220211099977 in words is "one trillion, two hundred twenty billion, two hundred eleven million, ninety-nine thousand, nine hundred seventy-seven".