21522131365 has 8 divisors (see below), whose sum is σ = 29516065920. Its totient is φ = 14758032912.

The previous prime is 21522131357. The next prime is 21522131377. The reversal of 21522131365 is 56313122512.

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

It is not a de Polignac number, because 21522131365 - 2³ = 21522131357 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, 307458985 + ... + 307459054.

It is an arithmetic number, because the mean of its divisors is an integer number (3689508240).

Almost surely, 2^21522131365 is an apocalyptic number.

It is an amenable number.

21522131365 is a deficient number, since it is larger than the sum of its proper divisors (7993934555).

21522131365 is an equidigital number, since it uses as much as digits as its factorization.

21522131365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614918051.

The product of its digits is 10800, while the sum is 31.

Adding to 21522131365 its reverse (56313122512), we get a palindrome (77835253877).

The spelling of 21522131365 in words is "twenty-one billion, five hundred twenty-two million, one hundred thirty-one thousand, three hundred sixty-five".