21525153415 has 16 divisors (see below), whose sum is σ = 27354808512. Its totient is φ = 16204091904.

The previous prime is 21525153367. The next prime is 21525153421. The reversal of 21525153415 is 51435152512.

It is a cyclic number.

It is not a de Polignac number, because 21525153415 - 2¹⁹ = 21524629127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489517 + ... + 531673.

It is an arithmetic number, because the mean of its divisors is an integer number (1709675532).

Almost surely, 2^21525153415 is an apocalyptic number.

21525153415 is a deficient number, since it is larger than the sum of its proper divisors (5829655097).

21525153415 is a wasteful number, since it uses less digits than its factorization.

21525153415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48186.

The product of its digits is 30000, while the sum is 34.

The spelling of 21525153415 in words is "twenty-one billion, five hundred twenty-five million, one hundred fifty-three thousand, four hundred fifteen".