215132420 has 48 divisors (see below), whose sum is σ = 459790128. Its totient is φ = 84541440.

The previous prime is 215132419. The next prime is 215132441. The reversal of 215132420 is 24231512.

It can be written as a sum of positive squares in 8 ways, for example, as 29246464 + 185885956 = 5408^2 + 13634^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 215132392 and 215132401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335300 + ... + 335940.

It is an arithmetic number, because the mean of its divisors is an integer number (9578961).

Almost surely, 2^215132420 is an apocalyptic number.

215132420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215132420 is an abundant number, since it is smaller than the sum of its proper divisors (244657708).

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

215132420 is a wasteful number, since it uses less digits than its factorization.

215132420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 215132420 is about 14667.3930880712. The cubic root of 215132420 is about 599.1956072543.

Adding to 215132420 its reverse (24231512), we get a palindrome (239363932).

The spelling of 215132420 in words is "two hundred fifteen million, one hundred thirty-two thousand, four hundred twenty".