21060243619 has 2 divisors, whose sum is σ = 21060243620. Its totient is φ = 21060243618.

The previous prime is 21060243599. The next prime is 21060243629. The reversal of 21060243619 is 91634206012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21060243619 is a prime.

It is a super-4 number, since 4×21060243619⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (21060243629) 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, 10530121809 + 10530121810.

It is an arithmetic number, because the mean of its divisors is an integer number (10530121810).

Almost surely, 2^21060243619 is an apocalyptic number.

21060243619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21060243619 is an equidigital number, since it uses as much as digits as its factorization.

21060243619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 21060243619 in words is "twenty-one billion, sixty million, two hundred forty-three thousand, six hundred nineteen".