21436000949 has 16 divisors (see below), whose sum is σ = 24052741440. Its totient is φ = 18932175360.

The previous prime is 21436000903. The next prime is 21436000973. The reversal of 21436000949 is 94900063412.

It is a cyclic number.

It is not a de Polignac number, because 21436000949 - 2⁸ = 21436000693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436000049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234782 + ... + 313040.

It is an arithmetic number, because the mean of its divisors is an integer number (1503296340).

Almost surely, 2^21436000949 is an apocalyptic number.

It is an amenable number.

21436000949 is a deficient number, since it is larger than the sum of its proper divisors (2616740491).

21436000949 is a wasteful number, since it uses less digits than its factorization.

21436000949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78980.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 21436000949 in words is "twenty-one billion, four hundred thirty-six million, nine hundred forty-nine", and thus it is an aban number.