21033101819 has 2 divisors, whose sum is σ = 21033101820. Its totient is φ = 21033101818.

The previous prime is 21033101813. The next prime is 21033101839. The reversal of 21033101819 is 91810133012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21033101819 - 2²⁰ = 21032053243 is a prime.

It is a super-2 number, since 2×21033101819² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21033101791 and 21033101800.

It is not a weakly prime, because it can be changed into another prime (21033101813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516550909 + 10516550910.

It is an arithmetic number, because the mean of its divisors is an integer number (10516550910).

Almost surely, 2^21033101819 is an apocalyptic number.

21033101819 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033101819 is an equidigital number, since it uses as much as digits as its factorization.

21033101819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 21033101819 in words is "twenty-one billion, thirty-three million, one hundred one thousand, eight hundred nineteen".