21019029443 has 2 divisors, whose sum is σ = 21019029444. Its totient is φ = 21019029442.

The previous prime is 21019029439. The next prime is 21019029557. The reversal of 21019029443 is 34492091012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21019029443 - 2² = 21019029439 is a prime.

It is not a weakly prime, because it can be changed into another prime (21019019443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10509514721 + 10509514722.

It is an arithmetic number, because the mean of its divisors is an integer number (10509514722).

Almost surely, 2^21019029443 is an apocalyptic number.

21019029443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21019029443 is an equidigital number, since it uses as much as digits as its factorization.

21019029443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 21019029443 in words is "twenty-one billion, nineteen million, twenty-nine thousand, four hundred forty-three".