215215430 has 16 divisors (see below), whose sum is σ = 396397584. Its totient is φ = 84084000.

The previous prime is 215215379. The next prime is 215215433. The reversal of 215215430 is 34512512.

It is a junction number, because it is equal to n+sod(n) for n = 215215396 and 215215405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215215433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249821 + ... + 250680.

It is an arithmetic number, because the mean of its divisors is an integer number (24774849).

Almost surely, 2^215215430 is an apocalyptic number.

215215430 is a deficient number, since it is larger than the sum of its proper divisors (181182154).

215215430 is a wasteful number, since it uses less digits than its factorization.

215215430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500551.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 215215430 is about 14670.2225613656. Note that the first 3 decimals coincide. The cubic root of 215215430 is about 599.2726649588.

Adding to 215215430 its reverse (34512512), we get a palindrome (249727942).

The spelling of 215215430 in words is "two hundred fifteen million, two hundred fifteen thousand, four hundred thirty".