21144234019 has 2 divisors, whose sum is σ = 21144234020. Its totient is φ = 21144234018.

The previous prime is 21144233969. The next prime is 21144234031. The reversal of 21144234019 is 91043244112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21144234019 - 2⁹ = 21144233507 is a prime.

It is a super-2 number, since 2×21144234019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21144234049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572117009 + 10572117010.

It is an arithmetic number, because the mean of its divisors is an integer number (10572117010).

Almost surely, 2^21144234019 is an apocalyptic number.

21144234019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144234019 is an equidigital number, since it uses as much as digits as its factorization.

21144234019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 21144234019 in words is "twenty-one billion, one hundred forty-four million, two hundred thirty-four thousand, nineteen".