21173741353 has 2 divisors, whose sum is σ = 21173741354. Its totient is φ = 21173741352.

The previous prime is 21173741333. The next prime is 21173741363. The reversal of 21173741353 is 35314737112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14435301609 + 6738439744 = 120147^2 + 82088^2 .

It is a cyclic number.

It is not a de Polignac number, because 21173741353 - 2¹⁷ = 21173610281 is a prime.

It is not a weakly prime, because it can be changed into another prime (21173741333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10586870676 + 10586870677.

It is an arithmetic number, because the mean of its divisors is an integer number (10586870677).

Almost surely, 2^21173741353 is an apocalyptic number.

It is an amenable number.

21173741353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21173741353 is an equidigital number, since it uses as much as digits as its factorization.

21173741353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 37.

The spelling of 21173741353 in words is "twenty-one billion, one hundred seventy-three million, seven hundred forty-one thousand, three hundred fifty-three".