121442645647 has 2 divisors, whose sum is σ = 121442645648. Its totient is φ = 121442645646.

The previous prime is 121442645617. The next prime is 121442645651. The reversal of 121442645647 is 746546244121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121442645647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121442645597 and 121442645606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121442645617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60721322823 + 60721322824.

It is an arithmetic number, because the mean of its divisors is an integer number (60721322824).

Almost surely, 2^121442645647 is an apocalyptic number.

121442645647 is a deficient number, since it is larger than the sum of its proper divisors (1).

121442645647 is an equidigital number, since it uses as much as digits as its factorization.

121442645647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 46.

Adding to 121442645647 its reverse (746546244121), we get a palindrome (867988889768).

The spelling of 121442645647 in words is "one hundred twenty-one billion, four hundred forty-two million, six hundred forty-five thousand, six hundred forty-seven".