20321002132187 has 2 divisors, whose sum is σ = 20321002132188. Its totient is φ = 20321002132186.

The previous prime is 20321002132153. The next prime is 20321002132243. The reversal of 20321002132187 is 78123120012302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321002132187 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321002132127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160501066093 + 10160501066094.

It is an arithmetic number, because the mean of its divisors is an integer number (10160501066094).

Almost surely, 2^{20321002132187} is an apocalyptic number.

20321002132187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321002132187 is an equidigital number, since it uses as much as digits as its factorization.

20321002132187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

Adding to 20321002132187 its reverse (78123120012302), we get a palindrome (98444122144489).

The spelling of 20321002132187 in words is "twenty trillion, three hundred twenty-one billion, two million, one hundred thirty-two thousand, one hundred eighty-seven".