121507533 has 32 divisors (see below), whose sum is σ = 208293120. Its totient is φ = 69424128.

The previous prime is 121507523. The next prime is 121507537. The reversal of 121507533 is 335705121.

121507533 is a `hidden beast` number, since 121 + 5 + 0 + 7 + 533 = 666.

It is not a de Polignac number, because 121507533 - 2⁸ = 121507277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 121507497 and 121507506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121507537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11341 + ... + 19277.

It is an arithmetic number, because the mean of its divisors is an integer number (6509160).

Almost surely, 2^121507533 is an apocalyptic number.

It is an amenable number.

121507533 is a deficient number, since it is larger than the sum of its proper divisors (86785587).

121507533 is an frugal number, since it uses more digits than its factorization.

121507533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7965 (or 7947 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 27.

The square root of 121507533 is about 11023.0455410472. The cubic root of 121507533 is about 495.2993230971.

It can be divided in two parts, 12150 and 7533, that added together give a 9-th power (19683 = 3⁹).

The spelling of 121507533 in words is "one hundred twenty-one million, five hundred seven thousand, five hundred thirty-three".