1221102201971 has 2 divisors, whose sum is σ = 1221102201972. Its totient is φ = 1221102201970.

The previous prime is 1221102201959. The next prime is 1221102202027. The reversal of 1221102201971 is 1791022011221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221102201971 - 2¹⁰ = 1221102200947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221102201901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610551100985 + 610551100986.

It is an arithmetic number, because the mean of its divisors is an integer number (610551100986).

Almost surely, 2^{1221102201971} is an apocalyptic number.

1221102201971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221102201971 is an equidigital number, since it uses as much as digits as its factorization.

1221102201971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The spelling of 1221102201971 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred one thousand, nine hundred seventy-one".