77121767060121 has 32 divisors (see below), whose sum is σ = 118936796267520. Its totient is φ = 43537881818304.

The previous prime is 77121767060111. The next prime is 77121767060131. The reversal of 77121767060121 is 12106076712177.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77121767060111) and next prime (77121767060131).

It is not a de Polignac number, because 77121767060121 - 2⁹ = 77121767059609 is a prime.

It is a super-2 number, since 2×77121767060121² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77121767060111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111701115 + ... + 112389423.

It is an arithmetic number, because the mean of its divisors is an integer number (3716774883360).

Almost surely, 2^{77121767060121} is an apocalyptic number.

It is an amenable number.

77121767060121 is a deficient number, since it is larger than the sum of its proper divisors (41815029207399).

77121767060121 is a wasteful number, since it uses less digits than its factorization.

77121767060121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752685.

The product of its (nonzero) digits is 345744, while the sum is 48.

The spelling of 77121767060121 in words is "seventy-seven trillion, one hundred twenty-one billion, seven hundred sixty-seven million, sixty thousand, one hundred twenty-one".