21415141549 has 2 divisors, whose sum is σ = 21415141550. Its totient is φ = 21415141548.

The previous prime is 21415141541. The next prime is 21415141567. The reversal of 21415141549 is 94514151412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19069676649 + 2345464900 = 138093^2 + 48430^2 .

It is a cyclic number.

It is not a de Polignac number, because 21415141549 - 2³ = 21415141541 is a prime.

It is a super-2 number, since 2×21415141549² (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 (21415141541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707570774 + 10707570775.

It is an arithmetic number, because the mean of its divisors is an integer number (10707570775).

Almost surely, 2^21415141549 is an apocalyptic number.

It is an amenable number.

21415141549 is a deficient number, since it is larger than the sum of its proper divisors (1).

21415141549 is an equidigital number, since it uses as much as digits as its factorization.

21415141549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

The spelling of 21415141549 in words is "twenty-one billion, four hundred fifteen million, one hundred forty-one thousand, five hundred forty-nine".