21526959009 has 8 divisors (see below), whose sum is σ = 28706081632. Its totient is φ = 14349571200.

The previous prime is 21526958989. The next prime is 21526959029. The reversal of 21526959009 is 90095962512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21526958989) and next prime (21526959029).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21526959009 - 2¹¹ = 21526956961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21526959029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404467 + ... + 454584.

It is an arithmetic number, because the mean of its divisors is an integer number (3588260204).

Almost surely, 2^21526959009 is an apocalyptic number.

It is an amenable number.

21526959009 is a deficient number, since it is larger than the sum of its proper divisors (7179122623).

21526959009 is an equidigital number, since it uses as much as digits as its factorization.

21526959009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867407.

The product of its (nonzero) digits is 437400, while the sum is 48.

The spelling of 21526959009 in words is "twenty-one billion, five hundred twenty-six million, nine hundred fifty-nine thousand, nine".