21135733356 has 48 divisors (see below), whose sum is σ = 49877549568. Its totient is φ = 6965524800.

The previous prime is 21135733351. The next prime is 21135733363. The reversal of 21135733356 is 65333753112.

It is not an unprimeable number, because it can be changed into a prime (21135733351) 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, 401206 + ... + 450818.

It is an arithmetic number, because the mean of its divisors is an integer number (1039115616).

Almost surely, 2^21135733356 is an apocalyptic number.

It is an amenable number.

21135733356 is an abundant number, since it is smaller than the sum of its proper divisors (28741816212).

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

21135733356 is a wasteful number, since it uses less digits than its factorization.

21135733356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50022 (or 50020 counting only the distinct ones).

The product of its digits is 170100, while the sum is 39.

The spelling of 21135733356 in words is "twenty-one billion, one hundred thirty-five million, seven hundred thirty-three thousand, three hundred fifty-six".