21064514741321 has 4 divisors (see below), whose sum is σ = 21111429028500. Its totient is φ = 21017600454144.

The previous prime is 21064514741209. The next prime is 21064514741353. The reversal of 21064514741321 is 12314741546012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15809251927225 + 5255262814096 = 3976085^2 + 2292436^2 .

It is a cyclic number.

It is not a de Polignac number, because 21064514741321 - 2³⁸ = 20789636834377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21064511741321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23457142916 + ... + 23457143813.

It is an arithmetic number, because the mean of its divisors is an integer number (5277857257125).

Almost surely, 2^{21064514741321} is an apocalyptic number.

It is an amenable number.

21064514741321 is a deficient number, since it is larger than the sum of its proper divisors (46914287179).

21064514741321 is an equidigital number, since it uses as much as digits as its factorization.

21064514741321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46914287178.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 21064514741321 in words is "twenty-one trillion, sixty-four billion, five hundred fourteen million, seven hundred forty-one thousand, three hundred twenty-one".