21470547253121 has 2 divisors, whose sum is σ = 21470547253122. Its totient is φ = 21470547253120.

The previous prime is 21470547253081. The next prime is 21470547253123. The reversal of 21470547253121 is 12135274507412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21140353362496 + 330193890625 = 4597864^2 + 574625^2 .

It is a cyclic number.

It is not a de Polignac number, because 21470547253121 - 2³⁴ = 21453367383937 is a prime.

Together with 21470547253123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21470547253123) 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 as a sum of consecutive naturals, namely, 10735273626560 + 10735273626561.

It is an arithmetic number, because the mean of its divisors is an integer number (10735273626561).

Almost surely, 2^{21470547253121} is an apocalyptic number.

It is an amenable number.

21470547253121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21470547253121 is an equidigital number, since it uses as much as digits as its factorization.

21470547253121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470400, while the sum is 44.

The spelling of 21470547253121 in words is "twenty-one trillion, four hundred seventy billion, five hundred forty-seven million, two hundred fifty-three thousand, one hundred twenty-one".