121855861252 has 24 divisors (see below), whose sum is σ = 223079967936. Its totient is φ = 58132074528.

The previous prime is 121855861213. The next prime is 121855861261. The reversal of 121855861252 is 252168558121.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1631638 + ... + 1704685.

It is an arithmetic number, because the mean of its divisors is an integer number (9294998664).

Almost surely, 2^121855861252 is an apocalyptic number.

It is an amenable number.

121855861252 is a deficient number, since it is larger than the sum of its proper divisors (101224106684).

121855861252 is a wasteful number, since it uses less digits than its factorization.

121855861252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3336747 (or 3336745 counting only the distinct ones).

The product of its digits is 384000, while the sum is 46.

The spelling of 121855861252 in words is "one hundred twenty-one billion, eight hundred fifty-five million, eight hundred sixty-one thousand, two hundred fifty-two".