1506540343421 has 8 divisors (see below), whose sum is σ = 1523634959160. Its totient is φ = 1489449443328.

The previous prime is 1506540343397. The next prime is 1506540343489. The reversal of 1506540343421 is 1243430456051.

It can be written as a sum of positive squares in 4 ways, for example, as 117230227321 + 1389310116100 = 342389^2 + 1178690^2 .

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-1506540343421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1506540343921) 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, 109316 + ... + 1739261.

It is an arithmetic number, because the mean of its divisors is an integer number (190454369895).

Almost surely, 2^{1506540343421} is an apocalyptic number.

It is an amenable number.

1506540343421 is a deficient number, since it is larger than the sum of its proper divisors (17094615739).

1506540343421 is an equidigital number, since it uses as much as digits as its factorization.

1506540343421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857823.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 1506540343421 its reverse (1243430456051), we get a palindrome (2749970799472).

The spelling of 1506540343421 in words is "one trillion, five hundred six billion, five hundred forty million, three hundred forty-three thousand, four hundred twenty-one".