2541555433421 has 4 divisors (see below), whose sum is σ = 2541573797532. Its totient is φ = 2541537069312.

The previous prime is 2541555433409. The next prime is 2541555433429. The reversal of 2541555433421 is 1243345551452.

It is a happy number.

2541555433421 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 1525259580196 + 1016295853225 = 1235014^2 + 1008115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2541555433421 - 2¹⁸ = 2541555171277 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 (2541555433429) 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, 8972870 + ... + 9251783.

It is an arithmetic number, because the mean of its divisors is an integer number (635393449383).

Almost surely, 2^{2541555433421} is an apocalyptic number.

It is an amenable number.

2541555433421 is a deficient number, since it is larger than the sum of its proper divisors (18364111).

2541555433421 is a wasteful number, since it uses less digits than its factorization.

2541555433421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18364110.

The product of its digits is 1440000, while the sum is 44.

The spelling of 2541555433421 in words is "two trillion, five hundred forty-one billion, five hundred fifty-five million, four hundred thirty-three thousand, four hundred twenty-one".