1023420042187 has 2 divisors, whose sum is σ = 1023420042188. Its totient is φ = 1023420042186.

The previous prime is 1023420042173. The next prime is 1023420042221. The reversal of 1023420042187 is 7812400243201.

It is an a-pointer prime, because the next prime (1023420042221) can be obtained adding 1023420042187 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023420042187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1023420048187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511710021093 + 511710021094.

It is an arithmetic number, because the mean of its divisors is an integer number (511710021094).

Almost surely, 2^{1023420042187} is an apocalyptic number.

1023420042187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023420042187 is an equidigital number, since it uses as much as digits as its factorization.

1023420042187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 34.

Adding to 1023420042187 its reverse (7812400243201), we get a palindrome (8835820285388).

The spelling of 1023420042187 in words is "one trillion, twenty-three billion, four hundred twenty million, forty-two thousand, one hundred eighty-seven".