21042125147 has 2 divisors, whose sum is σ = 21042125148. Its totient is φ = 21042125146.

The previous prime is 21042125119. The next prime is 21042125183. The reversal of 21042125147 is 74152124012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21042125147 - 2³² = 16747157851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21042125107) 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, 10521062573 + 10521062574.

It is an arithmetic number, because the mean of its divisors is an integer number (10521062574).

Almost surely, 2^21042125147 is an apocalyptic number.

21042125147 is a deficient number, since it is larger than the sum of its proper divisors (1).

21042125147 is an equidigital number, since it uses as much as digits as its factorization.

21042125147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

Adding to 21042125147 its reverse (74152124012), we get a palindrome (95194249159).

The spelling of 21042125147 in words is "twenty-one billion, forty-two million, one hundred twenty-five thousand, one hundred forty-seven".