21355066236 has 48 divisors (see below), whose sum is σ = 56985626880. Its totient is φ = 6097292160.

The previous prime is 21355066223. The next prime is 21355066247. The reversal of 21355066236 is 63266055312.

It is a junction number, because it is equal to n+sod(n) for n = 21355066194 and 21355066203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38575 + ... + 210233.

It is an arithmetic number, because the mean of its divisors is an integer number (1187200560).

Almost surely, 2^21355066236 is an apocalyptic number.

It is an amenable number.

21355066236 is an abundant number, since it is smaller than the sum of its proper divisors (35630560644).

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

21355066236 is a wasteful number, since it uses less digits than its factorization.

21355066236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173154 (or 173152 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 39.

The spelling of 21355066236 in words is "twenty-one billion, three hundred fifty-five million, sixty-six thousand, two hundred thirty-six".