215021430 has 96 divisors (see below), whose sum is σ = 618456384. Its totient is φ = 51487488.

The previous prime is 215021407. The next prime is 215021459. The reversal of 215021430 is 34120512.

215021430 is a `hidden beast` number, since 21 + 502 + 143 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 47 ways as a sum of consecutive naturals, for example, 40807 + ... + 45773.

It is an arithmetic number, because the mean of its divisors is an integer number (6442254).

Almost surely, 2^215021430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215021430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309228192).

215021430 is an abundant number, since it is smaller than the sum of its proper divisors (403434954).

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

215021430 is a wasteful number, since it uses less digits than its factorization.

215021430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030 (or 5027 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 215021430 is about 14663.6090373414. The cubic root of 215021430 is about 599.0925449007.

Adding to 215021430 its reverse (34120512), we get a palindrome (249141942).

The spelling of 215021430 in words is "two hundred fifteen million, twenty-one thousand, four hundred thirty".