121553133 has 8 divisors (see below), whose sum is σ = 174537888. Its totient is φ = 74801904.

The previous prime is 121553041. The next prime is 121553149. The reversal of 121553133 is 331355121.

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

It is not a de Polignac number, because 121553133 - 2⁹ = 121552621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121553533) 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, 1558335 + ... + 1558412.

It is an arithmetic number, because the mean of its divisors is an integer number (21817236).

Almost surely, 2^121553133 is an apocalyptic number.

121553133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

121553133 is a deficient number, since it is larger than the sum of its proper divisors (52984755).

121553133 is a wasteful number, since it uses less digits than its factorization.

121553133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116763.

The product of its digits is 1350, while the sum is 24.

The square root of 121553133 is about 11025.1137409099. The cubic root of 121553133 is about 495.3612748785.

The spelling of 121553133 in words is "one hundred twenty-one million, five hundred fifty-three thousand, one hundred thirty-three".