21341004187 has 2 divisors, whose sum is σ = 21341004188. Its totient is φ = 21341004186.

The previous prime is 21341004169. The next prime is 21341004277. The reversal of 21341004187 is 78140014312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21341004187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21341004127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670502093 + 10670502094.

It is an arithmetic number, because the mean of its divisors is an integer number (10670502094).

Almost surely, 2^21341004187 is an apocalyptic number.

21341004187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21341004187 is an equidigital number, since it uses as much as digits as its factorization.

21341004187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

Adding to 21341004187 its reverse (78140014312), we get a palindrome (99481018499).

The spelling of 21341004187 in words is "twenty-one billion, three hundred forty-one million, four thousand, one hundred eighty-seven".