421121524 has 24 divisors (see below), whose sum is σ = 748362888. Its totient is φ = 207313920.

The previous prime is 421121497. The next prime is 421121549. The reversal of 421121524 is 425121124.

It can be written as a sum of positive squares in 4 ways, for example, as 1281424 + 419840100 = 1132^2 + 20490^2 .

It is a junction number, because it is equal to n+sod(n) for n = 421121495 and 421121504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256434 + ... + 258070.

It is an arithmetic number, because the mean of its divisors is an integer number (31181787).

Almost surely, 2^421121524 is an apocalyptic number.

It is an amenable number.

421121524 is a deficient number, since it is larger than the sum of its proper divisors (327241364).

421121524 is a wasteful number, since it uses less digits than its factorization.

421121524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595 (or 2593 counting only the distinct ones).

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

The square root of 421121524 is about 20521.2456736914. The cubic root of 421121524 is about 749.5532296182.

Adding to 421121524 its reverse (425121124), we get a palindrome (846242648).

The spelling of 421121524 in words is "four hundred twenty-one million, one hundred twenty-one thousand, five hundred twenty-four".