45121138921 has 4 divisors (see below), whose sum is σ = 45628118100. Its totient is φ = 44614159744.

The previous prime is 45121138913. The next prime is 45121138943. The reversal of 45121138921 is 12983112154.

45121138921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2670305625 + 42450833296 = 51675^2 + 206036^2 .

It is a cyclic number.

It is not a de Polignac number, because 45121138921 - 2³ = 45121138913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45121138901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253489456 + ... + 253489633.

It is an arithmetic number, because the mean of its divisors is an integer number (11407029525).

Almost surely, 2^45121138921 is an apocalyptic number.

It is an amenable number.

45121138921 is a deficient number, since it is larger than the sum of its proper divisors (506979179).

45121138921 is an equidigital number, since it uses as much as digits as its factorization.

45121138921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506979178.

The product of its digits is 17280, while the sum is 37.

The spelling of 45121138921 in words is "forty-five billion, one hundred twenty-one million, one hundred thirty-eight thousand, nine hundred twenty-one".