21406126833 has 24 divisors (see below), whose sum is σ = 38055338048. Its totient is φ = 11291143392.

The previous prime is 21406126813. The next prime is 21406126871. The reversal of 21406126833 is 33862160412.

21406126833 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 612 + 6 + 8 + 33 = 666.

It is not a de Polignac number, because 21406126833 - 2¹⁰ = 21406125809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21406126813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13067635 + ... + 13069272.

Almost surely, 2^21406126833 is an apocalyptic number.

It is an amenable number.

21406126833 is a deficient number, since it is larger than the sum of its proper divisors (16649211215).

21406126833 is a wasteful number, since it uses less digits than its factorization.

21406126833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26136933 (or 26136930 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21406126833 in words is "twenty-one billion, four hundred six million, one hundred twenty-six thousand, eight hundred thirty-three".