21615566103321 has 8 divisors (see below), whose sum is σ = 30337636636320. Its totient is φ = 13651936486272.

The previous prime is 21615566103317. The next prime is 21615566103377. The reversal of 21615566103321 is 12330166551612.

It is a happy number.

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

It is not a de Polignac number, because 21615566103321 - 2² = 21615566103317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21615566103721) 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 7 ways as a sum of consecutive naturals, for example, 189610228920 + ... + 189610229033.

It is an arithmetic number, because the mean of its divisors is an integer number (3792204579540).

Almost surely, 2^{21615566103321} is an apocalyptic number.

It is an amenable number.

21615566103321 is a deficient number, since it is larger than the sum of its proper divisors (8722070532999).

21615566103321 is a wasteful number, since it uses less digits than its factorization.

21615566103321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379220457975.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 21615566103321 in words is "twenty-one trillion, six hundred fifteen billion, five hundred sixty-six million, one hundred three thousand, three hundred twenty-one".