121855012 has 12 divisors (see below), whose sum is σ = 222518016. Its totient is φ = 58278440.

The previous prime is 121855009. The next prime is 121855033. The reversal of 121855012 is 210558121.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662164 + ... + 662347.

It is an arithmetic number, because the mean of its divisors is an integer number (18543168).

Almost surely, 2^121855012 is an apocalyptic number.

It is an amenable number.

121855012 is a deficient number, since it is larger than the sum of its proper divisors (100663004).

121855012 is a wasteful number, since it uses less digits than its factorization.

121855012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324538 (or 1324536 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 121855012 is about 11038.7957676551. The cubic root of 121855012 is about 495.7710148797.

The spelling of 121855012 in words is "one hundred twenty-one million, eight hundred fifty-five thousand, twelve".