21052352415 has 8 divisors (see below), whose sum is σ = 33683763888. Its totient is φ = 11227921280.

The previous prime is 21052352333. The next prime is 21052352443. The reversal of 21052352415 is 51425325012.

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

It is not a de Polignac number, because 21052352415 - 2¹⁴ = 21052336031 is a prime.

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, 701745066 + ... + 701745095.

It is an arithmetic number, because the mean of its divisors is an integer number (4210470486).

Almost surely, 2^21052352415 is an apocalyptic number.

21052352415 is a deficient number, since it is larger than the sum of its proper divisors (12631411473).

21052352415 is a wasteful number, since it uses less digits than its factorization.

21052352415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403490169.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21052352415 its reverse (51425325012), we get a palindrome (72477677427).

The spelling of 21052352415 in words is "twenty-one billion, fifty-two million, three hundred fifty-two thousand, four hundred fifteen".