21434465639 has 2 divisors, whose sum is σ = 21434465640. Its totient is φ = 21434465638.

The previous prime is 21434465629. The next prime is 21434465713. The reversal of 21434465639 is 93656443412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21434465639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21434465593 and 21434465602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434465609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717232819 + 10717232820.

It is an arithmetic number, because the mean of its divisors is an integer number (10717232820).

Almost surely, 2^21434465639 is an apocalyptic number.

21434465639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434465639 is an equidigital number, since it uses as much as digits as its factorization.

21434465639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 47.

The spelling of 21434465639 in words is "twenty-one billion, four hundred thirty-four million, four hundred sixty-five thousand, six hundred thirty-nine".