121421524 has 12 divisors (see below), whose sum is σ = 242843104. Its totient is φ = 52037784.

The previous prime is 121421519. The next prime is 121421563. The reversal of 121421524 is 425124121.

121421524 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 121421495 and 121421504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2168214 + ... + 2168269.

Almost surely, 2^121421524 is an apocalyptic number.

121421524 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121421524 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

121421524 is a wasteful number, since it uses less digits than its factorization.

121421524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336494 (or 4336492 counting only the distinct ones).

The product of its digits is 640, while the sum is 22.

The square root of 121421524 is about 11019.1435238861. The cubic root of 121421524 is about 495.1824297823.

Adding to 121421524 its reverse (425124121), we get a palindrome (546545645).

The spelling of 121421524 in words is "one hundred twenty-one million, four hundred twenty-one thousand, five hundred twenty-four".