21235130215 has 8 divisors (see below), whose sum is σ = 27442322208. Its totient is φ = 15681326880.

The previous prime is 21235130179. The next prime is 21235130233. The reversal of 21235130215 is 51203153212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21235130215 - 2⁹ = 21235129703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21235130215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163347091 + ... + 163347220.

It is an arithmetic number, because the mean of its divisors is an integer number (3430290276).

Almost surely, 2^21235130215 is an apocalyptic number.

21235130215 is a deficient number, since it is larger than the sum of its proper divisors (6207191993).

21235130215 is a wasteful number, since it uses less digits than its factorization.

21235130215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326694329.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21235130215 its reverse (51203153212), we get a palindrome (72438283427).

The spelling of 21235130215 in words is "twenty-one billion, two hundred thirty-five million, one hundred thirty thousand, two hundred fifteen".