21539342154227 has 2 divisors, whose sum is σ = 21539342154228. Its totient is φ = 21539342154226.

The previous prime is 21539342154221. The next prime is 21539342154241. The reversal of 21539342154227 is 72245124393512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21539342154227 - 2³² = 21535047186931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21539342154221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10769671077113 + 10769671077114.

It is an arithmetic number, because the mean of its divisors is an integer number (10769671077114).

Almost surely, 2^{21539342154227} is an apocalyptic number.

21539342154227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21539342154227 is an equidigital number, since it uses as much as digits as its factorization.

21539342154227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 50.

The spelling of 21539342154227 in words is "twenty-one trillion, five hundred thirty-nine billion, three hundred forty-two million, one hundred fifty-four thousand, two hundred twenty-seven".