1211211201973 has 2 divisors, whose sum is σ = 1211211201974. Its totient is φ = 1211211201972.

The previous prime is 1211211201947. The next prime is 1211211202009. The reversal of 1211211201973 is 3791021121121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863669118244 + 347542083729 = 929338^2 + 589527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211211201973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211211201073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605605600986 + 605605600987.

It is an arithmetic number, because the mean of its divisors is an integer number (605605600987).

Almost surely, 2^{1211211201973} is an apocalyptic number.

It is an amenable number.

1211211201973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211211201973 is an equidigital number, since it uses as much as digits as its factorization.

1211211201973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 31.

The spelling of 1211211201973 in words is "one trillion, two hundred eleven billion, two hundred eleven million, two hundred one thousand, nine hundred seventy-three".