121859001853 has 2 divisors, whose sum is σ = 121859001854. Its totient is φ = 121859001852.

The previous prime is 121859001839. The next prime is 121859001881. The reversal of 121859001853 is 358100958121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121799604004 + 59397849 = 348998^2 + 7707^2 .

It is a cyclic number.

It is not a de Polignac number, because 121859001853 - 2²⁵ = 121825447421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121859001893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60929500926 + 60929500927.

It is an arithmetic number, because the mean of its divisors is an integer number (60929500927).

Almost surely, 2^121859001853 is an apocalyptic number.

It is an amenable number.

121859001853 is a deficient number, since it is larger than the sum of its proper divisors (1).

121859001853 is an equidigital number, since it uses as much as digits as its factorization.

121859001853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 43.

Adding to 121859001853 its reverse (358100958121), we get a palindrome (479959959974).

The spelling of 121859001853 in words is "one hundred twenty-one billion, eight hundred fifty-nine million, one thousand, eight hundred fifty-three".