121371405797869 has 2 divisors, whose sum is σ = 121371405797870. Its totient is φ = 121371405797868.

The previous prime is 121371405797867. The next prime is 121371405797879. The reversal of 121371405797869 is 968797504173121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121330445300100 + 40960497769 = 11015010^2 + 202387^2 .

It is a cyclic number.

It is not a de Polignac number, because 121371405797869 - 2¹ = 121371405797867 is a prime.

It is a super-2 number, since 2×121371405797869² (a number of 29 digits) contains 22 as substring.

Together with 121371405797867, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121371405797798 and 121371405797807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121371405797867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60685702898934 + 60685702898935.

It is an arithmetic number, because the mean of its divisors is an integer number (60685702898935).

It is a 1-persistent number, because it is pandigital, but 2⋅121371405797869 = 242742811595738 is not.

Almost surely, 2^{121371405797869} is an apocalyptic number.

It is an amenable number.

121371405797869 is a deficient number, since it is larger than the sum of its proper divisors (1).

121371405797869 is an equidigital number, since it uses as much as digits as its factorization.

121371405797869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160030080, while the sum is 70.

The spelling of 121371405797869 in words is "one hundred twenty-one trillion, three hundred seventy-one billion, four hundred five million, seven hundred ninety-seven thousand, eight hundred sixty-nine".