2541421531021 has 4 divisors (see below), whose sum is σ = 2577216200544. Its totient is φ = 2505626861500.

The previous prime is 2541421531013. The next prime is 2541421531027. The reversal of 2541421531021 is 1201351241452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2541421531021 - 2³ = 2541421531013 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 (2541421531027) 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, 17897334655 + ... + 17897334796.

It is an arithmetic number, because the mean of its divisors is an integer number (644304050136).

Almost surely, 2^{2541421531021} is an apocalyptic number.

It is an amenable number.

2541421531021 is a deficient number, since it is larger than the sum of its proper divisors (35794669523).

2541421531021 is an equidigital number, since it uses as much as digits as its factorization.

2541421531021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35794669522.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 2541421531021 its reverse (1201351241452), we get a palindrome (3742772772473).

The spelling of 2541421531021 in words is "two trillion, five hundred forty-one billion, four hundred twenty-one million, five hundred thirty-one thousand, twenty-one".