1221200477741 has 2 divisors, whose sum is σ = 1221200477742. Its totient is φ = 1221200477740.

The previous prime is 1221200477699. The next prime is 1221200477807. The reversal of 1221200477741 is 1477740021221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1170786756841 + 50413720900 = 1082029^2 + 224530^2 .

It is an emirp because it is prime and its reverse (1477740021221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221200477741 - 2⁶ = 1221200477677 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221200477695 and 1221200477704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221200417741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600238870 + 610600238871.

It is an arithmetic number, because the mean of its divisors is an integer number (610600238871).

Almost surely, 2^{1221200477741} is an apocalyptic number.

It is an amenable number.

1221200477741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221200477741 is an equidigital number, since it uses as much as digits as its factorization.

1221200477741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43904, while the sum is 38.

Adding to 1221200477741 its reverse (1477740021221), we get a palindrome (2698940498962).

The spelling of 1221200477741 in words is "one trillion, two hundred twenty-one billion, two hundred million, four hundred seventy-seven thousand, seven hundred forty-one".