1201200021971 has 2 divisors, whose sum is σ = 1201200021972. Its totient is φ = 1201200021970.

The previous prime is 1201200021929. The next prime is 1201200022007. The reversal of 1201200021971 is 1791200021021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1201200021971 - 2²⁶ = 1201132913107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201200021971.

It is not a weakly prime, because it can be changed into another prime (1201200021071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600600010985 + 600600010986.

It is an arithmetic number, because the mean of its divisors is an integer number (600600010986).

Almost surely, 2^{1201200021971} is an apocalyptic number.

1201200021971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201200021971 is an equidigital number, since it uses as much as digits as its factorization.

1201200021971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 26.

Adding to 1201200021971 its reverse (1791200021021), we get a palindrome (2992400042992).

The spelling of 1201200021971 in words is "one trillion, two hundred one billion, two hundred million, twenty-one thousand, nine hundred seventy-one".