21226878507 has 8 divisors (see below), whose sum is σ = 28304836560. Its totient is φ = 14150086400.

The previous prime is 21226878499. The next prime is 21226878529. The reversal of 21226878507 is 70587862212.

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

It is a cyclic number.

It is not a de Polignac number, because 21226878507 - 2³ = 21226878499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21226078507) 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, 248082 + ... + 322487.

It is an arithmetic number, because the mean of its divisors is an integer number (3538104570).

Almost surely, 2^21226878507 is an apocalyptic number.

21226878507 is a deficient number, since it is larger than the sum of its proper divisors (7077958053).

21226878507 is a wasteful number, since it uses less digits than its factorization.

21226878507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582973.

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 21226878507 in words is "twenty-one billion, two hundred twenty-six million, eight hundred seventy-eight thousand, five hundred seven".