121021311545 has 8 divisors (see below), whose sum is σ = 145323115080. Its totient is φ = 96752021760.

The previous prime is 121021311529. The next prime is 121021311557. The reversal of 121021311545 is 545113120121.

It can be written as a sum of positive squares in 4 ways, for example, as 28246852624 + 92774458921 = 168068^2 + 304589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121021311545 - 2⁴ = 121021311529 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8120246 + ... + 8135135.

It is an arithmetic number, because the mean of its divisors is an integer number (18165389385).

Almost surely, 2^121021311545 is an apocalyptic number.

It is an amenable number.

121021311545 is a deficient number, since it is larger than the sum of its proper divisors (24301803535).

121021311545 is a wasteful number, since it uses less digits than its factorization.

121021311545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16256875.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 121021311545 its reverse (545113120121), we get a palindrome (666134431666).

The spelling of 121021311545 in words is "one hundred twenty-one billion, twenty-one million, three hundred eleven thousand, five hundred forty-five".