21202322387 has 2 divisors, whose sum is σ = 21202322388. Its totient is φ = 21202322386.

The previous prime is 21202322377. The next prime is 21202322419. The reversal of 21202322387 is 78322320212.

It is an a-pointer prime, because the next prime (21202322419) can be obtained adding 21202322387 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21202322387 - 2⁸ = 21202322131 is a prime.

It is a super-3 number, since 3×21202322387³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21202322377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601161193 + 10601161194.

It is an arithmetic number, because the mean of its divisors is an integer number (10601161194).

Almost surely, 2^21202322387 is an apocalyptic number.

21202322387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202322387 is an equidigital number, since it uses as much as digits as its factorization.

21202322387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

Adding to 21202322387 its reverse (78322320212), we get a palindrome (99524642599).

The spelling of 21202322387 in words is "twenty-one billion, two hundred two million, three hundred twenty-two thousand, three hundred eighty-seven".