21022424387 has 2 divisors, whose sum is σ = 21022424388. Its totient is φ = 21022424386.

The previous prime is 21022424299. The next prime is 21022424459. The reversal of 21022424387 is 78342422012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21022424387 - 2⁸ = 21022424131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022420387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511212193 + 10511212194.

It is an arithmetic number, because the mean of its divisors is an integer number (10511212194).

Almost surely, 2^21022424387 is an apocalyptic number.

21022424387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022424387 is an equidigital number, since it uses as much as digits as its factorization.

21022424387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 35.

Adding to 21022424387 its reverse (78342422012), we get a palindrome (99364846399).

The spelling of 21022424387 in words is "twenty-one billion, twenty-two million, four hundred twenty-four thousand, three hundred eighty-seven".