21236000652 has 18 divisors (see below), whose sum is σ = 53679890628. Its totient is φ = 7078666872.

The previous prime is 21236000633. The next prime is 21236000713. The reversal of 21236000652 is 25600063212.

21236000652 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 6 + 0 + 0 + 0 + 652 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 294944418 + ... + 294944489.

It is an arithmetic number, because the mean of its divisors is an integer number (2982216146).

Almost surely, 2^21236000652 is an apocalyptic number.

It is an amenable number.

21236000652 is an abundant number, since it is smaller than the sum of its proper divisors (32443889976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21236000652 is a wasteful number, since it uses less digits than its factorization.

21236000652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589888917 (or 589888912 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21236000652 its reverse (25600063212), we get a palindrome (46836063864).

The spelling of 21236000652 in words is "twenty-one billion, two hundred thirty-six million, six hundred fifty-two", and thus it is an aban number.