77235521121 has 12 divisors (see below), whose sum is σ = 121704457680. Its totient is φ = 46809406680.

The previous prime is 77235521119. The next prime is 77235521123. The reversal of 77235521121 is 12112553277.

77235521121 is a `hidden beast` number, since 7 + 7 + 2 + 3 + 5 + 521 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (77235521119) and next prime (77235521123).

It is not a de Polignac number, because 77235521121 - 2¹ = 77235521119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77235521123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390078291 + ... + 390078488.

It is an arithmetic number, because the mean of its divisors is an integer number (10142038140).

Almost surely, 2^77235521121 is an apocalyptic number.

It is an amenable number.

77235521121 is a deficient number, since it is larger than the sum of its proper divisors (44468936559).

77235521121 is a wasteful number, since it uses less digits than its factorization.

77235521121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780156796 (or 780156793 counting only the distinct ones).

The product of its digits is 29400, while the sum is 36.

The spelling of 77235521121 in words is "seventy-seven billion, two hundred thirty-five million, five hundred twenty-one thousand, one hundred twenty-one".