21369001387 has 2 divisors, whose sum is σ = 21369001388. Its totient is φ = 21369001386.

The previous prime is 21369001369. The next prime is 21369001457. The reversal of 21369001387 is 78310096312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21369001387 - 2³¹ = 19221517739 is a prime.

It is not a weakly prime, because it can be changed into another prime (21369001307) 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, 10684500693 + 10684500694.

It is an arithmetic number, because the mean of its divisors is an integer number (10684500694).

Almost surely, 2^21369001387 is an apocalyptic number.

21369001387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21369001387 is an equidigital number, since it uses as much as digits as its factorization.

21369001387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

Adding to 21369001387 its reverse (78310096312), we get a palindrome (99679097699).

The spelling of 21369001387 in words is "twenty-one billion, three hundred sixty-nine million, one thousand, three hundred eighty-seven".