21303500401387 has 2 divisors, whose sum is σ = 21303500401388. Its totient is φ = 21303500401386.

The previous prime is 21303500401357. The next prime is 21303500401411. The reversal of 21303500401387 is 78310400530312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303500401387 is a prime.

It is a super-2 number, since 2×21303500401387² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21303500401357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651750200693 + 10651750200694.

It is an arithmetic number, because the mean of its divisors is an integer number (10651750200694).

Almost surely, 2^{21303500401387} is an apocalyptic number.

21303500401387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303500401387 is an equidigital number, since it uses as much as digits as its factorization.

21303500401387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

Adding to 21303500401387 its reverse (78310400530312), we get a palindrome (99613900931699).

The spelling of 21303500401387 in words is "twenty-one trillion, three hundred three billion, five hundred million, four hundred one thousand, three hundred eighty-seven".