121216021577 has 8 divisors (see below), whose sum is σ = 143309582400. Its totient is φ = 100316707344.

The previous prime is 121216021547. The next prime is 121216021613. The reversal of 121216021577 is 775120612121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121216021577 - 2⁸ = 121216021321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121216021547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298561427 + ... + 298561832.

It is an arithmetic number, because the mean of its divisors is an integer number (17913697800).

Almost surely, 2^121216021577 is an apocalyptic number.

It is an amenable number.

121216021577 is a deficient number, since it is larger than the sum of its proper divisors (22093560823).

121216021577 is an equidigital number, since it uses as much as digits as its factorization.

121216021577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597123295.

The product of its (nonzero) digits is 11760, while the sum is 35.

Adding to 121216021577 its reverse (775120612121), we get a palindrome (896336633698).

The spelling of 121216021577 in words is "one hundred twenty-one billion, two hundred sixteen million, twenty-one thousand, five hundred seventy-seven".