121533147 has 12 divisors (see below), whose sum is σ = 177159840. Its totient is φ = 80278128.

The previous prime is 121533133. The next prime is 121533157. The reversal of 121533147 is 741335121.

121533147 is a `hidden beast` number, since 121 + 533 + 1 + 4 + 7 = 666.

It is not a de Polignac number, because 121533147 - 2¹⁶ = 121467611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121533147.

It is not an unprimeable number, because it can be changed into a prime (121533107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60963 + ... + 62924.

It is an arithmetic number, because the mean of its divisors is an integer number (14763320).

Almost surely, 2^121533147 is an apocalyptic number.

121533147 is a deficient number, since it is larger than the sum of its proper divisors (55626693).

121533147 is a wasteful number, since it uses less digits than its factorization.

121533147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124002 (or 123999 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 121533147 is about 11024.2073184424. The cubic root of 121533147 is about 495.3341239724.

Adding to 121533147 its reverse (741335121), we get a palindrome (862868268).

The spelling of 121533147 in words is "one hundred twenty-one million, five hundred thirty-three thousand, one hundred forty-seven".