121716971545 has 16 divisors (see below), whose sum is σ = 157374165312. Its totient is φ = 89838509760.

The previous prime is 121716971507. The next prime is 121716971557. The reversal of 121716971545 is 545179617121.

It is not a de Polignac number, because 121716971545 - 2⁷ = 121716971417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334867 + ... + 596296.

It is an arithmetic number, because the mean of its divisors is an integer number (9835885332).

Almost surely, 2^121716971545 is an apocalyptic number.

It is an amenable number.

121716971545 is a deficient number, since it is larger than the sum of its proper divisors (35657193767).

121716971545 is a wasteful number, since it uses less digits than its factorization.

121716971545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933192.

The product of its digits is 529200, while the sum is 49.

The spelling of 121716971545 in words is "one hundred twenty-one billion, seven hundred sixteen million, nine hundred seventy-one thousand, five hundred forty-five".