21133444019 has 2 divisors, whose sum is σ = 21133444020. Its totient is φ = 21133444018.

The previous prime is 21133443997. The next prime is 21133444043. The reversal of 21133444019 is 91044433112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21133444019 - 2²⁰ = 21132395443 is a prime.

It is a super-2 number, since 2×21133444019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21133444819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566722009 + 10566722010.

It is an arithmetic number, because the mean of its divisors is an integer number (10566722010).

Almost surely, 2^21133444019 is an apocalyptic number.

21133444019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133444019 is an equidigital number, since it uses as much as digits as its factorization.

21133444019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21133444019 in words is "twenty-one billion, one hundred thirty-three million, four hundred forty-four thousand, nineteen".