21112078433 has 2 divisors, whose sum is σ = 21112078434. Its totient is φ = 21112078432.

The previous prime is 21112078423. The next prime is 21112078451. The reversal of 21112078433 is 33487021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17390224384 + 3721854049 = 131872^2 + 61007^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112078433 - 2⁴ = 21112078417 is a prime.

It is a super-2 number, since 2×21112078433² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21112078433.

It is not a weakly prime, because it can be changed into another prime (21112078423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556039216 + 10556039217.

It is an arithmetic number, because the mean of its divisors is an integer number (10556039217).

Almost surely, 2^21112078433 is an apocalyptic number.

It is an amenable number.

21112078433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112078433 is an equidigital number, since it uses as much as digits as its factorization.

21112078433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

Adding to 21112078433 its reverse (33487021112), we get a palindrome (54599099545).

The spelling of 21112078433 in words is "twenty-one billion, one hundred twelve million, seventy-eight thousand, four hundred thirty-three".