8134404542021 has 4 divisors (see below), whose sum is σ = 8332804652844. Its totient is φ = 7936004431200.

The previous prime is 8134404542009. The next prime is 8134404542023. The reversal of 8134404542021 is 1202454044318.

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 486889950625 + 7647514591396 = 697775^2 + 2765414^2 .

It is a cyclic number.

It is not a de Polignac number, because 8134404542021 - 2⁴² = 3736358030917 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 (8134404542023) 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, 99200055350 + ... + 99200055431.

It is an arithmetic number, because the mean of its divisors is an integer number (2083201163211).

Almost surely, 2^{8134404542021} is an apocalyptic number.

It is an amenable number.

8134404542021 is a deficient number, since it is larger than the sum of its proper divisors (198400110823).

8134404542021 is a wasteful number, since it uses less digits than its factorization.

8134404542021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198400110822.

The product of its (nonzero) digits is 122880, while the sum is 38.

Adding to 8134404542021 its reverse (1202454044318), we get a palindrome (9336858586339).

The spelling of 8134404542021 in words is "eight trillion, one hundred thirty-four billion, four hundred four million, five hundred forty-two thousand, twenty-one".