121773621764 has 12 divisors (see below), whose sum is σ = 214185584844. Its totient is φ = 60577740384.

The previous prime is 121773621733. The next prime is 121773621841. The reversal of 121773621764 is 467126377121.

It can be written as a sum of positive squares in 2 ways, for example, as 120102447364 + 1671174400 = 346558^2 + 40880^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77266739 + ... + 77268314.

It is an arithmetic number, because the mean of its divisors is an integer number (17848798737).

Almost surely, 2^121773621764 is an apocalyptic number.

It is an amenable number.

121773621764 is a deficient number, since it is larger than the sum of its proper divisors (92411963080).

121773621764 is a wasteful number, since it uses less digits than its factorization.

121773621764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154535254 (or 154535252 counting only the distinct ones).

The product of its digits is 592704, while the sum is 47.

Adding to 121773621764 its reverse (467126377121), we get a palindrome (588899998885).

The spelling of 121773621764 in words is "one hundred twenty-one billion, seven hundred seventy-three million, six hundred twenty-one thousand, seven hundred sixty-four".