21442542523147 has 2 divisors, whose sum is σ = 21442542523148. Its totient is φ = 21442542523146.

The previous prime is 21442542523099. The next prime is 21442542523159. The reversal of 21442542523147 is 74132524524412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21442542523147 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21442542523097 and 21442542523106.

It is not a weakly prime, because it can be changed into another prime (21442542563147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721271261573 + 10721271261574.

It is an arithmetic number, because the mean of its divisors is an integer number (10721271261574).

Almost surely, 2^{21442542523147} is an apocalyptic number.

21442542523147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442542523147 is an equidigital number, since it uses as much as digits as its factorization.

21442542523147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2150400, while the sum is 46.

The spelling of 21442542523147 in words is "twenty-one trillion, four hundred forty-two billion, five hundred forty-two million, five hundred twenty-three thousand, one hundred forty-seven".