121605144 has 16 divisors (see below), whose sum is σ = 304012920. Its totient is φ = 40535040.

The previous prime is 121605137. The next prime is 121605193. The reversal of 121605144 is 441506121.

It is a happy number.

It is a super-2 number, since 2×121605144² = 29575622094521472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 5066881 = 121605144 / (1 + 2 + 1 + 6 + 0 + 5 + 1 + 4 + 4).

It is a zygodrome in base 2.

It is a congruent number.

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, 2533417 + ... + 2533464.

Almost surely, 2^121605144 is an apocalyptic number.

It is an amenable number.

121605144 is an abundant number, since it is smaller than the sum of its proper divisors (182407776).

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

121605144 is a wasteful number, since it uses less digits than its factorization.

121605144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066890 (or 5066886 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 121605144 is about 11027.4722398200. The cubic root of 121605144 is about 495.4319176797.

The spelling of 121605144 in words is "one hundred twenty-one million, six hundred five thousand, one hundred forty-four".