21470657024477 has 2 divisors, whose sum is σ = 21470657024478. Its totient is φ = 21470657024476.

The previous prime is 21470657024449. The next prime is 21470657024497. The reversal of 21470657024477 is 77442075607412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20135583078361 + 1335073946116 = 4487269^2 + 1155454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21470657024477 is a prime.

It is a super-3 number, since 3×21470657024477³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21470657024497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735328512238 + 10735328512239.

It is an arithmetic number, because the mean of its divisors is an integer number (10735328512239).

Almost surely, 2^{21470657024477} is an apocalyptic number.

It is an amenable number.

21470657024477 is a deficient number, since it is larger than the sum of its proper divisors (1).

21470657024477 is an equidigital number, since it uses as much as digits as its factorization.

21470657024477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18439680, while the sum is 56.

The spelling of 21470657024477 in words is "twenty-one trillion, four hundred seventy billion, six hundred fifty-seven million, twenty-four thousand, four hundred seventy-seven".