21131255305321 has 8 divisors (see below), whose sum is σ = 25421059014080. Its totient is φ = 17159214834288.

The previous prime is 21131255305271. The next prime is 21131255305367. The reversal of 21131255305321 is 12350355213112.

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

It is a cyclic number.

It is not a de Polignac number, because 21131255305321 - 2³⁵ = 21096895566953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131255303321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79440809286 + ... + 79440809551.

It is an arithmetic number, because the mean of its divisors is an integer number (3177632376760).

Almost surely, 2^{21131255305321} is an apocalyptic number.

It is an amenable number.

21131255305321 is a deficient number, since it is larger than the sum of its proper divisors (4289803708759).

21131255305321 is a wasteful number, since it uses less digits than its factorization.

21131255305321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158881618863.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 21131255305321 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred fifty-five million, three hundred five thousand, three hundred twenty-one".