127773765121 has 16 divisors (see below), whose sum is σ = 131110881984. Its totient is φ = 124472896704.

The previous prime is 127773765089. The next prime is 127773765137. The reversal of 127773765121 is 121567377721.

It is a cyclic number.

It is not a de Polignac number, because 127773765121 - 2⁵ = 127773765089 is a prime.

It is a super-2 number, since 2×127773765121² (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 (127773765151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7207150 + ... + 7224856.

It is an arithmetic number, because the mean of its divisors is an integer number (8194430124).

Almost surely, 2^127773765121 is an apocalyptic number.

It is an amenable number.

127773765121 is a deficient number, since it is larger than the sum of its proper divisors (3337116863).

127773765121 is a wasteful number, since it uses less digits than its factorization.

127773765121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18720.

The product of its digits is 864360, while the sum is 49.

The spelling of 127773765121 in words is "one hundred twenty-seven billion, seven hundred seventy-three million, seven hundred sixty-five thousand, one hundred twenty-one".