21033033019 has 4 divisors (see below), whose sum is σ = 21033469744. Its totient is φ = 21032596296.

The previous prime is 21033033017. The next prime is 21033033083. The reversal of 21033033019 is 91033033012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21033033019 - 2¹ = 21033033017 is a prime.

It is a super-2 number, since 2×21033033019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21033032984 and 21033033002.

It is not an unprimeable number, because it can be changed into a prime (21033033013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135687 + ... + 245920.

It is an arithmetic number, because the mean of its divisors is an integer number (5258367436).

Almost surely, 2^21033033019 is an apocalyptic number.

21033033019 is a deficient number, since it is larger than the sum of its proper divisors (436725).

21033033019 is an equidigital number, since it uses as much as digits as its factorization.

21033033019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436724.

The product of its (nonzero) digits is 1458, while the sum is 25.

The spelling of 21033033019 in words is "twenty-one billion, thirty-three million, thirty-three thousand, nineteen".