21045000019 has 2 divisors, whose sum is σ = 21045000020. Its totient is φ = 21045000018.

The previous prime is 21045000013. The next prime is 21045000029. The reversal of 21045000019 is 91000054012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21045000019 - 2¹⁹ = 21044475731 is a prime.

It is a super-2 number, since 2×21045000019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21045000013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522500009 + 10522500010.

It is an arithmetic number, because the mean of its divisors is an integer number (10522500010).

Almost surely, 2^21045000019 is an apocalyptic number.

21045000019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21045000019 is an equidigital number, since it uses as much as digits as its factorization.

21045000019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 22.

The spelling of 21045000019 in words is "twenty-one billion, forty-five million, nineteen", and thus it is an aban number and an uban number.