21266004099 has 8 divisors (see below), whose sum is σ = 28427564880. Its totient is φ = 14140889696.

The previous prime is 21266004047. The next prime is 21266004103. The reversal of 21266004099 is 99040066212.

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 21266004099 - 2¹⁶ = 21265938563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21266004299) 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, 9110232 + ... + 9112565.

It is an arithmetic number, because the mean of its divisors is an integer number (3553445610).

Almost surely, 2^21266004099 is an apocalyptic number.

21266004099 is a deficient number, since it is larger than the sum of its proper divisors (7161560781).

21266004099 is a wasteful number, since it uses less digits than its factorization.

21266004099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18223189.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 21266004099 in words is "twenty-one billion, two hundred sixty-six million, four thousand, ninety-nine".