1903685521121 has 2 divisors, whose sum is σ = 1903685521122. Its totient is φ = 1903685521120.

The previous prime is 1903685521081. The next prime is 1903685521141. The reversal of 1903685521121 is 1211255863091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1026653271121 + 877032250000 = 1013239^2 + 936500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1903685521121 - 2³⁴ = 1886505651937 is a prime.

It is not a weakly prime, because it can be changed into another prime (1903685521141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 951842760560 + 951842760561.

It is an arithmetic number, because the mean of its divisors is an integer number (951842760561).

Almost surely, 2^{1903685521121} is an apocalyptic number.

It is an amenable number.

1903685521121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1903685521121 is an equidigital number, since it uses as much as digits as its factorization.

1903685521121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 1903685521121 in words is "one trillion, nine hundred three billion, six hundred eighty-five million, five hundred twenty-one thousand, one hundred twenty-one".