21154241039 has 2 divisors, whose sum is σ = 21154241040. Its totient is φ = 21154241038.

The previous prime is 21154241027. The next prime is 21154241041. The reversal of 21154241039 is 93014245112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21154241039 is a prime.

It is a super-2 number, since 2×21154241039² (a number of 21 digits) contains 22 as substring.

Together with 21154241041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21154240996 and 21154241014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21154241089) 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, 10577120519 + 10577120520.

It is an arithmetic number, because the mean of its divisors is an integer number (10577120520).

Almost surely, 2^21154241039 is an apocalyptic number.

21154241039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154241039 is an equidigital number, since it uses as much as digits as its factorization.

21154241039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 21154241039 in words is "twenty-one billion, one hundred fifty-four million, two hundred forty-one thousand, thirty-nine".