21470546673137 has 2 divisors, whose sum is σ = 21470546673138. Its totient is φ = 21470546673136.

The previous prime is 21470546673097. The next prime is 21470546673151. The reversal of 21470546673137 is 73137664507412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14619182838016 + 6851363835121 = 3823504^2 + 2617511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21470546673137 is a prime.

It is not a weakly prime, because it can be changed into another prime (21470546673197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735273336568 + 10735273336569.

It is an arithmetic number, because the mean of its divisors is an integer number (10735273336569).

Almost surely, 2^{21470546673137} is an apocalyptic number.

It is an amenable number.

21470546673137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21470546673137 is an equidigital number, since it uses as much as digits as its factorization.

21470546673137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17781120, while the sum is 56.

The spelling of 21470546673137 in words is "twenty-one trillion, four hundred seventy billion, five hundred forty-six million, six hundred seventy-three thousand, one hundred thirty-seven".