121820047 has 2 divisors, whose sum is σ = 121820048. Its totient is φ = 121820046.

The previous prime is 121820009. The next prime is 121820063. The reversal of 121820047 is 740028121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121820047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121820087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60910023 + 60910024.

It is an arithmetic number, because the mean of its divisors is an integer number (60910024).

Almost surely, 2^121820047 is an apocalyptic number.

121820047 is a deficient number, since it is larger than the sum of its proper divisors (1).

121820047 is an equidigital number, since it uses as much as digits as its factorization.

121820047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 121820047 is about 11037.2119214954. The cubic root of 121820047 is about 495.7235916032.

Adding to 121820047 its reverse (740028121), we get a palindrome (861848168).

The spelling of 121820047 in words is "one hundred twenty-one million, eight hundred twenty thousand, forty-seven".