215324421 has 24 divisors (see below), whose sum is σ = 312359040. Its totient is φ = 131878656.

The previous prime is 215324411. The next prime is 215324441. The reversal of 215324421 is 124423512.

215324421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 215324421 - 2¹³ = 215316229 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 215324391 and 215324400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215324411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120285 + ... + 122061.

It is an arithmetic number, because the mean of its divisors is an integer number (13014960).

Almost surely, 2^215324421 is an apocalyptic number.

It is an amenable number.

215324421 is a deficient number, since it is larger than the sum of its proper divisors (97034619).

215324421 is a wasteful number, since it uses less digits than its factorization.

215324421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045 (or 2032 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 215324421 is about 14673.9367928310. The cubic root of 215324421 is about 599.3738105943.

Adding to 215324421 its reverse (124423512), we get a palindrome (339747933).

Subtracting from 215324421 its reverse (124423512), we obtain a palindrome (90900909).

The spelling of 215324421 in words is "two hundred fifteen million, three hundred twenty-four thousand, four hundred twenty-one".