121130155521 has 24 divisors (see below), whose sum is σ = 176264289344. Its totient is φ = 80155202400.

The previous prime is 121130155513. The next prime is 121130155567. The reversal of 121130155521 is 125551031121.

It is a happy number.

121130155521 is a `hidden beast` number, since 1 + 2 + 1 + 130 + 1 + 5 + 5 + 521 = 666.

It is not a de Polignac number, because 121130155521 - 2³ = 121130155513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121130154521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1322046 + ... + 1410696.

Almost surely, 2^121130155521 is an apocalyptic number.

It is an amenable number.

121130155521 is a deficient number, since it is larger than the sum of its proper divisors (55134133823).

121130155521 is a wasteful number, since it uses less digits than its factorization.

121130155521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89781 (or 89778 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

Adding to 121130155521 its reverse (125551031121), we get a palindrome (246681186642).

The spelling of 121130155521 in words is "one hundred twenty-one billion, one hundred thirty million, one hundred fifty-five thousand, five hundred twenty-one".