21030052187 has 2 divisors, whose sum is σ = 21030052188. Its totient is φ = 21030052186.

The previous prime is 21030052163. The next prime is 21030052243. The reversal of 21030052187 is 78125003012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030052187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21030852187) 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, 10515026093 + 10515026094.

It is an arithmetic number, because the mean of its divisors is an integer number (10515026094).

Almost surely, 2^21030052187 is an apocalyptic number.

21030052187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030052187 is an equidigital number, since it uses as much as digits as its factorization.

21030052187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 21030052187 its reverse (78125003012), we get a palindrome (99155055199).

The spelling of 21030052187 in words is "twenty-one billion, thirty million, fifty-two thousand, one hundred eighty-seven".