21333403439 has 2 divisors, whose sum is σ = 21333403440. Its totient is φ = 21333403438.

The previous prime is 21333403387. The next prime is 21333403457. The reversal of 21333403439 is 93430433312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21333403439 - 2⁸ = 21333403183 is a prime.

It is a super-2 number, since 2×21333403439² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21333403399 and 21333403408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21333403489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666701719 + 10666701720.

It is an arithmetic number, because the mean of its divisors is an integer number (10666701720).

Almost surely, 2^21333403439 is an apocalyptic number.

21333403439 is a deficient number, since it is larger than the sum of its proper divisors (1).

21333403439 is an equidigital number, since it uses as much as digits as its factorization.

21333403439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 35.

The spelling of 21333403439 in words is "twenty-one billion, three hundred thirty-three million, four hundred three thousand, four hundred thirty-nine".