21321107259 has 4 divisors (see below), whose sum is σ = 28428143016. Its totient is φ = 14214071504.

The previous prime is 21321107251. The next prime is 21321107263. The reversal of 21321107259 is 95270112312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21321107259 - 2³ = 21321107251 is a prime.

It is a super-2 number, since 2×21321107259² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21321107251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3553517874 + ... + 3553517879.

It is an arithmetic number, because the mean of its divisors is an integer number (7107035754).

Almost surely, 2^21321107259 is an apocalyptic number.

21321107259 is a deficient number, since it is larger than the sum of its proper divisors (7107035757).

21321107259 is an equidigital number, since it uses as much as digits as its factorization.

21321107259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7107035756.

The product of its (nonzero) digits is 7560, while the sum is 33.

The spelling of 21321107259 in words is "twenty-one billion, three hundred twenty-one million, one hundred seven thousand, two hundred fifty-nine".