215403221234 has 48 divisors (see below), whose sum is σ = 344296795392. Its totient is φ = 100943708544.

The previous prime is 215403221203. The next prime is 215403221237. The reversal of 215403221234 is 432122304512.

It is a junction number, because it is equal to n+sod(n) for n = 215403221197 and 215403221206.

It is not an unprimeable number, because it can be changed into a prime (215403221237) 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, 16950527 + ... + 16963229.

It is an arithmetic number, because the mean of its divisors is an integer number (7172849904).

Almost surely, 2^215403221234 is an apocalyptic number.

215403221234 is a deficient number, since it is larger than the sum of its proper divisors (128893574158).

215403221234 is a wasteful number, since it uses less digits than its factorization.

215403221234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12931 (or 12858 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 215403221234 its reverse (432122304512), we get a palindrome (647525525746).

The spelling of 215403221234 in words is "two hundred fifteen billion, four hundred three million, two hundred twenty-one thousand, two hundred thirty-four".