215421130 has 32 divisors (see below), whose sum is σ = 392999040. Its totient is φ = 85012800.

The previous prime is 215421121. The next prime is 215421133. The reversal of 215421130 is 31124512.

It is a junction number, because it is equal to n+sod(n) for n = 215421098 and 215421107.

It is not an unprimeable number, because it can be changed into a prime (215421133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269892 + ... + 270688.

It is an arithmetic number, because the mean of its divisors is an integer number (12281220).

Almost surely, 2^215421130 is an apocalyptic number.

215421130 is a deficient number, since it is larger than the sum of its proper divisors (177577910).

215421130 is a wasteful number, since it uses less digits than its factorization.

215421130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 215421130 is about 14677.2316872086. The cubic root of 215421130 is about 599.4635297350.

Adding to 215421130 its reverse (31124512), we get a palindrome (246545642).

The spelling of 215421130 in words is "two hundred fifteen million, four hundred twenty-one thousand, one hundred thirty".