21742423151 has 2 divisors, whose sum is σ = 21742423152. Its totient is φ = 21742423150.

The previous prime is 21742423133. The next prime is 21742423163. The reversal of 21742423151 is 15132424712.

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-21742423151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21742422151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10871211575 + 10871211576.

It is an arithmetic number, because the mean of its divisors is an integer number (10871211576).

Almost surely, 2^21742423151 is an apocalyptic number.

21742423151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21742423151 is an equidigital number, since it uses as much as digits as its factorization.

21742423151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

Adding to 21742423151 its reverse (15132424712), we get a palindrome (36874847863).

The spelling of 21742423151 in words is "twenty-one billion, seven hundred forty-two million, four hundred twenty-three thousand, one hundred fifty-one".