40120134521 has 8 divisors (see below), whose sum is σ = 42518886120. Its totient is φ = 37725687808.

The previous prime is 40120134499. The next prime is 40120134553. The reversal of 40120134521 is 12543102104.

It can be written as a sum of positive squares in 4 ways, for example, as 204490000 + 39915644521 = 14300^2 + 199789^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40120134521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40120134721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1057016 + ... + 1094313.

It is an arithmetic number, because the mean of its divisors is an integer number (5314860765).

Almost surely, 2^40120134521 is an apocalyptic number.

It is an amenable number.

40120134521 is a deficient number, since it is larger than the sum of its proper divisors (2398751599).

40120134521 is a wasteful number, since it uses less digits than its factorization.

40120134521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152443.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 40120134521 its reverse (12543102104), we get a palindrome (52663236625).

The spelling of 40120134521 in words is "forty billion, one hundred twenty million, one hundred thirty-four thousand, five hundred twenty-one".