21011352536 has 8 divisors (see below), whose sum is σ = 39396286020. Its totient is φ = 10505676264.

The previous prime is 21011352529. The next prime is 21011352563. The reversal of 21011352536 is 63525311012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21011352499 and 21011352508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313209526 + ... + 1313209541.

Almost surely, 2^21011352536 is an apocalyptic number.

It is an amenable number.

21011352536 is a deficient number, since it is larger than the sum of its proper divisors (18384933484).

21011352536 is a wasteful number, since it uses less digits than its factorization.

21011352536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626419073 (or 2626419069 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 21011352536 its reverse (63525311012), we get a palindrome (84536663548).

The spelling of 21011352536 in words is "twenty-one billion, eleven million, three hundred fifty-two thousand, five hundred thirty-six".