21002113415 has 8 divisors (see below), whose sum is σ = 25228497168. Its totient is φ = 16784383360.

The previous prime is 21002113397. The next prime is 21002113427. The reversal of 21002113415 is 51431120012.

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

It is not a de Polignac number, because 21002113415 - 2²⁸ = 20733677959 is a prime.

It is a Duffinian number.

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, 2158082 + ... + 2167791.

It is an arithmetic number, because the mean of its divisors is an integer number (3153562146).

Almost surely, 2^21002113415 is an apocalyptic number.

21002113415 is a deficient number, since it is larger than the sum of its proper divisors (4226383753).

21002113415 is an equidigital number, since it uses as much as digits as its factorization.

21002113415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4326849.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21002113415 its reverse (51431120012), we get a palindrome (72433233427).

The spelling of 21002113415 in words is "twenty-one billion, two million, one hundred thirteen thousand, four hundred fifteen".