21496640307 has 8 divisors (see below), whose sum is σ = 28662872784. Its totient is φ = 14330750688.

The previous prime is 21496640293. The next prime is 21496640357. The reversal of 21496640307 is 70304669412.

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

It is not a de Polignac number, because 21496640307 - 2⁸ = 21496640051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21496640357) 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, 167173 + ... + 266345.

It is an arithmetic number, because the mean of its divisors is an integer number (3582859098).

Almost surely, 2^21496640307 is an apocalyptic number.

21496640307 is a deficient number, since it is larger than the sum of its proper divisors (7166232477).

21496640307 is an equidigital number, since it uses as much as digits as its factorization.

21496640307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171429.

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 21496640307 in words is "twenty-one billion, four hundred ninety-six million, six hundred forty thousand, three hundred seven".