121530510 has 32 divisors (see below), whose sum is σ = 324082080. Its totient is φ = 32408064.

The previous prime is 121530499. The next prime is 121530523. The reversal of 121530510 is 15035121.

121530510 is a `hidden beast` number, since 1 + 2 + 153 + 0 + 510 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224787 + ... + 225326.

It is an arithmetic number, because the mean of its divisors is an integer number (10127565).

Almost surely, 2^121530510 is an apocalyptic number.

121530510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121530510 is an abundant number, since it is smaller than the sum of its proper divisors (202551570).

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

121530510 is a wasteful number, since it uses less digits than its factorization.

121530510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450129 (or 450123 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 121530510 is about 11024.0877173578. The cubic root of 121530510 is about 495.3305413955.

Adding to 121530510 its reverse (15035121), we get a palindrome (136565631).

The spelling of 121530510 in words is "one hundred twenty-one million, five hundred thirty thousand, five hundred ten".