121859001861 has 8 divisors (see below), whose sum is σ = 162938950080. Its totient is φ = 81009194112.

The previous prime is 121859001853. The next prime is 121859001881. The reversal of 121859001861 is 168100958121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121859001861 - 2³ = 121859001853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121859001811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57533881 + ... + 57535998.

It is an arithmetic number, because the mean of its divisors is an integer number (20367368760).

Almost surely, 2^121859001861 is an apocalyptic number.

It is an amenable number.

121859001861 is a deficient number, since it is larger than the sum of its proper divisors (41079948219).

121859001861 is a wasteful number, since it uses less digits than its factorization.

121859001861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115070235.

The product of its (nonzero) digits is 34560, while the sum is 42.

Adding to 121859001861 its reverse (168100958121), we get a palindrome (289959959982).

The spelling of 121859001861 in words is "one hundred twenty-one billion, eight hundred fifty-nine million, one thousand, eight hundred sixty-one".