21522531315 has 16 divisors (see below), whose sum is σ = 34438636800. Its totient is φ = 11477821152.

The previous prime is 21522531287. The next prime is 21522531319. The reversal of 21522531315 is 51313522512.

It is not a de Polignac number, because 21522531315 - 2¹¹ = 21522529267 is a prime.

It is a super-3 number, since 3×21522531315³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21522531319) by changing a digit.

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, 187276 + ... + 279494.

It is an arithmetic number, because the mean of its divisors is an integer number (2152414800).

Almost surely, 2^21522531315 is an apocalyptic number.

21522531315 is a deficient number, since it is larger than the sum of its proper divisors (12916105485).

21522531315 is a wasteful number, since it uses less digits than its factorization.

21522531315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107786.

The product of its digits is 9000, while the sum is 30.

The spelling of 21522531315 in words is "twenty-one billion, five hundred twenty-two million, five hundred thirty-one thousand, three hundred fifteen".