21241264006345 has 8 divisors (see below), whose sum is σ = 25838688271176. Its totient is φ = 16760230229376.

The previous prime is 21241264006307. The next prime is 21241264006349. The reversal of 21241264006345 is 54360046214212.

It can be written as a sum of positive squares in 4 ways, for example, as 425368753209 + 20815895253136 = 652203^2 + 4562444^2 .

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 21241264006345 - 2²³ = 21241255617737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21241264006298 and 21241264006307.

It is not an unprimeable number, because it can be changed into a prime (21241264006349) 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, 29097621562 + ... + 29097622291.

It is an arithmetic number, because the mean of its divisors is an integer number (3229836033897).

Almost surely, 2^{21241264006345} is an apocalyptic number.

It is an amenable number.

21241264006345 is a deficient number, since it is larger than the sum of its proper divisors (4597424264831).

21241264006345 is an equidigital number, since it uses as much as digits as its factorization.

21241264006345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58195243931.

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 21241264006345 in words is "twenty-one trillion, two hundred forty-one billion, two hundred sixty-four million, six thousand, three hundred forty-five".