21222052413615 has 32 divisors (see below), whose sum is σ = 38080692207360. Its totient is φ = 11212648245792.

The previous prime is 21222052413607. The next prime is 21222052413629. The reversal of 21222052413615 is 51631425022212.

21222052413615 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 2 + 0 + 5 + 24 + 13 + 615 = 666.

It is not a de Polignac number, because 21222052413615 - 2³ = 21222052413607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222052413615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 734566809 + ... + 734595698.

It is an arithmetic number, because the mean of its divisors is an integer number (1190021631480).

Almost surely, 2^{21222052413615} is an apocalyptic number.

21222052413615 is a deficient number, since it is larger than the sum of its proper divisors (16858639793745).

21222052413615 is a wasteful number, since it uses less digits than its factorization.

21222052413615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469162628 (or 1469162622 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 21222052413615 its reverse (51631425022212), we get a palindrome (72853477435827).

The spelling of 21222052413615 in words is "twenty-one trillion, two hundred twenty-two billion, fifty-two million, four hundred thirteen thousand, six hundred fifteen".