121859001860 has 48 divisors (see below), whose sum is σ = 271604067840. Its totient is φ = 45766786560.

The previous prime is 121859001853. The next prime is 121859001881. The reversal of 121859001860 is 68100958121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285236 + ... + 570155.

It is an arithmetic number, because the mean of its divisors is an integer number (5658418080).

Almost surely, 2^121859001860 is an apocalyptic number.

121859001860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121859001860 is an abundant number, since it is smaller than the sum of its proper divisors (149745065980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121859001860 is a wasteful number, since it uses less digits than its factorization.

121859001860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855836 (or 855834 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 41.

Adding to 121859001860 its reverse (68100958121), we get a palindrome (189959959981).

The spelling of 121859001860 in words is "one hundred twenty-one billion, eight hundred fifty-nine million, one thousand, eight hundred sixty".