21541636027 has 2 divisors, whose sum is σ = 21541636028. Its totient is φ = 21541636026.

The previous prime is 21541636013. The next prime is 21541636043. The reversal of 21541636027 is 72063614512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21541636027 is a prime.

It is not a weakly prime, because it can be changed into another prime (21541630027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10770818013 + 10770818014.

It is an arithmetic number, because the mean of its divisors is an integer number (10770818014).

Almost surely, 2^21541636027 is an apocalyptic number.

21541636027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21541636027 is an equidigital number, since it uses as much as digits as its factorization.

21541636027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 21541636027 in words is "twenty-one billion, five hundred forty-one million, six hundred thirty-six thousand, twenty-seven".