121404520 has 16 divisors (see below), whose sum is σ = 273160260. Its totient is φ = 48561792.

The previous prime is 121404499. The next prime is 121404529. The reversal of 121404520 is 25404121.

It can be written as a sum of positive squares in 2 ways, for example, as 121132036 + 272484 = 11006^2 + 522^2 .

It is not an unprimeable number, because it can be changed into a prime (121404529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1517517 + ... + 1517596.

Almost surely, 2^121404520 is an apocalyptic number.

121404520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121404520 is an abundant number, since it is smaller than the sum of its proper divisors (151755740).

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

121404520 is a wasteful number, since it uses less digits than its factorization.

121404520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3035124 (or 3035120 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 121404520 is about 11018.3719305531. The cubic root of 121404520 is about 495.1593134109.

Adding to 121404520 its reverse (25404121), we get a palindrome (146808641).

The spelling of 121404520 in words is "one hundred twenty-one million, four hundred four thousand, five hundred twenty".