21323451709 has 16 divisors (see below), whose sum is σ = 24665056000. Its totient is φ = 18056545920.

The previous prime is 21323451697. The next prime is 21323451719. The reversal of 21323451709 is 90715432312.

It is not a de Polignac number, because 21323451709 - 2¹⁷ = 21323320637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323451719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268417 + ... + 338665.

It is an arithmetic number, because the mean of its divisors is an integer number (1541566000).

Almost surely, 2^21323451709 is an apocalyptic number.

It is an amenable number.

21323451709 is a deficient number, since it is larger than the sum of its proper divisors (3341604291).

21323451709 is a wasteful number, since it uses less digits than its factorization.

21323451709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70780.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 21323451709 in words is "twenty-one billion, three hundred twenty-three million, four hundred fifty-one thousand, seven hundred nine".