21236000653 has 16 divisors (see below), whose sum is σ = 25701404544. Its totient is φ = 17128857600.

The previous prime is 21236000633. The next prime is 21236000713. The reversal of 21236000653 is 35600063212.

It is a cyclic number.

It is not a de Polignac number, because 21236000653 - 2¹³ = 21235992461 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 (21236000633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1133226 + ... + 1151812.

It is an arithmetic number, because the mean of its divisors is an integer number (1606337784).

Almost surely, 2^21236000653 is an apocalyptic number.

It is an amenable number.

21236000653 is a deficient number, since it is larger than the sum of its proper divisors (4465403891).

21236000653 is a wasteful number, since it uses less digits than its factorization.

21236000653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28212.

The product of its (nonzero) digits is 6480, while the sum is 28.

Adding to 21236000653 its reverse (35600063212), we get a palindrome (56836063865).

The spelling of 21236000653 in words is "twenty-one billion, two hundred thirty-six million, six hundred fifty-three", and thus it is an aban number.