21084354712 has 8 divisors (see below), whose sum is σ = 39533165100. Its totient is φ = 10542177352.

The previous prime is 21084354671. The next prime is 21084354713. The reversal of 21084354712 is 21745348012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21084354713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317772162 + ... + 1317772177.

Almost surely, 2^21084354712 is an apocalyptic number.

It is an amenable number.

21084354712 is a deficient number, since it is larger than the sum of its proper divisors (18448810388).

21084354712 is a wasteful number, since it uses less digits than its factorization.

21084354712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635544345 (or 2635544341 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 21084354712 in words is "twenty-one billion, eighty-four million, three hundred fifty-four thousand, seven hundred twelve".