21234142507 has 2 divisors, whose sum is σ = 21234142508. Its totient is φ = 21234142506.

The previous prime is 21234142483. The next prime is 21234142529. The reversal of 21234142507 is 70524143212.

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-21234142507 is a prime.

It is not a weakly prime, because it can be changed into another prime (21234142807) 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, 10617071253 + 10617071254.

It is an arithmetic number, because the mean of its divisors is an integer number (10617071254).

Almost surely, 2^21234142507 is an apocalyptic number.

21234142507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234142507 is an equidigital number, since it uses as much as digits as its factorization.

21234142507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 21234142507 its reverse (70524143212), we get a palindrome (91758285719).

The spelling of 21234142507 in words is "twenty-one billion, two hundred thirty-four million, one hundred forty-two thousand, five hundred seven".