121713087019 has 4 divisors (see below), whose sum is σ = 121713875920. Its totient is φ = 121712298120.

The previous prime is 121713087017. The next prime is 121713087053. The reversal of 121713087019 is 910780317121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 910780317121 = 500057 ⋅1821353.

It is a cyclic number.

It is not a de Polignac number, because 121713087019 - 2¹ = 121713087017 is a prime.

It is a super-2 number, since 2×121713087019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121713087017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78864 + ... + 499645.

It is an arithmetic number, because the mean of its divisors is an integer number (30428468980).

Almost surely, 2^121713087019 is an apocalyptic number.

121713087019 is a deficient number, since it is larger than the sum of its proper divisors (788901).

121713087019 is an equidigital number, since it uses as much as digits as its factorization.

121713087019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788900.

The product of its (nonzero) digits is 21168, while the sum is 40.

The spelling of 121713087019 in words is "one hundred twenty-one billion, seven hundred thirteen million, eighty-seven thousand, nineteen".