21525140015 has 8 divisors (see below), whose sum is σ = 26460172368. Its totient is φ = 16800109120.

The previous prime is 21525140009. The next prime is 21525140027. The reversal of 21525140015 is 51004152512.

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

It is not a de Polignac number, because 21525140015 - 2¹⁶ = 21525074479 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 7 ways as a sum of consecutive naturals, for example, 52500137 + ... + 52500546.

It is an arithmetic number, because the mean of its divisors is an integer number (3307521546).

Almost surely, 2^21525140015 is an apocalyptic number.

21525140015 is a deficient number, since it is larger than the sum of its proper divisors (4935032353).

21525140015 is a wasteful number, since it uses less digits than its factorization.

21525140015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105000729.

The product of its (nonzero) digits is 2000, while the sum is 26.

Adding to 21525140015 its reverse (51004152512), we get a palindrome (72529292527).

The spelling of 21525140015 in words is "twenty-one billion, five hundred twenty-five million, one hundred forty thousand, fifteen".