21357177341 has 2 divisors, whose sum is σ = 21357177342. Its totient is φ = 21357177340.

The previous prime is 21357177253. The next prime is 21357177403. The reversal of 21357177341 is 14377175312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17231812900 + 4125364441 = 131270^2 + 64229^2 .

It is a cyclic number.

It is not a de Polignac number, because 21357177341 - 2²⁶ = 21290068477 is a prime.

It is a super-2 number, since 2×21357177341² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21357177041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678588670 + 10678588671.

It is an arithmetic number, because the mean of its divisors is an integer number (10678588671).

Almost surely, 2^21357177341 is an apocalyptic number.

It is an amenable number.

21357177341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21357177341 is an equidigital number, since it uses as much as digits as its factorization.

21357177341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123480, while the sum is 41.

The spelling of 21357177341 in words is "twenty-one billion, three hundred fifty-seven million, one hundred seventy-seven thousand, three hundred forty-one".