121207925779 has 4 divisors (see below), whose sum is σ = 128337803784. Its totient is φ = 114078047776.

The previous prime is 121207925767. The next prime is 121207925801. The reversal of 121207925779 is 977529702121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977529702121 = 7 ⋅139647100303.

It is a cyclic number.

It is not a de Polignac number, because 121207925779 - 2⁷ = 121207925651 is a prime.

It is a super-2 number, since 2×121207925779² (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 (121207922779) 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, 3564938977 + ... + 3564939010.

It is an arithmetic number, because the mean of its divisors is an integer number (32084450946).

Almost surely, 2^121207925779 is an apocalyptic number.

121207925779 is a deficient number, since it is larger than the sum of its proper divisors (7129878005).

121207925779 is an equidigital number, since it uses as much as digits as its factorization.

121207925779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129878004.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The spelling of 121207925779 in words is "one hundred twenty-one billion, two hundred seven million, nine hundred twenty-five thousand, seven hundred seventy-nine".