21241656019 has 2 divisors, whose sum is σ = 21241656020. Its totient is φ = 21241656018.

The previous prime is 21241655999. The next prime is 21241656031. The reversal of 21241656019 is 91065614212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21241656019 - 2³³ = 12651721427 is a prime.

It is a super-2 number, since 2×21241656019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21241656089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620828009 + 10620828010.

It is an arithmetic number, because the mean of its divisors is an integer number (10620828010).

Almost surely, 2^21241656019 is an apocalyptic number.

21241656019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241656019 is an equidigital number, since it uses as much as digits as its factorization.

21241656019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 21241656019 in words is "twenty-one billion, two hundred forty-one million, six hundred fifty-six thousand, nineteen".