21013040215 has 8 divisors (see below), whose sum is σ = 26542787760. Its totient is φ = 15925672512.

The previous prime is 21013040207. The next prime is 21013040287. The reversal of 21013040215 is 51204031012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013040215 - 2³ = 21013040207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 21013040192 and 21013040201.

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, 110594854 + ... + 110595043.

It is an arithmetic number, because the mean of its divisors is an integer number (3317848470).

Almost surely, 2^21013040215 is an apocalyptic number.

21013040215 is a deficient number, since it is larger than the sum of its proper divisors (5529747545).

21013040215 is a wasteful number, since it uses less digits than its factorization.

21013040215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221189921.

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

Adding to 21013040215 its reverse (51204031012), we get a palindrome (72217071227).

The spelling of 21013040215 in words is "twenty-one billion, thirteen million, forty thousand, two hundred fifteen".