77921012122 has 16 divisors (see below), whose sum is σ = 117044911872. Its totient is φ = 38906073280.

The previous prime is 77921012111. The next prime is 77921012171. The reversal of 77921012122 is 22121012977.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6815703 + ... + 6827125.

It is an arithmetic number, because the mean of its divisors is an integer number (7315306992).

Almost surely, 2^77921012122 is an apocalyptic number.

77921012122 is a deficient number, since it is larger than the sum of its proper divisors (39123899750).

77921012122 is a wasteful number, since it uses less digits than its factorization.

77921012122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15893.

The product of its (nonzero) digits is 7056, while the sum is 34.

The spelling of 77921012122 in words is "seventy-seven billion, nine hundred twenty-one million, twelve thousand, one hundred twenty-two".