21408966949700 has 72 divisors (see below), whose sum is σ = 51759179950464. Its totient is φ = 7619438896000.

The previous prime is 21408966949693. The next prime is 21408966949751. The reversal of 21408966949700 is 794966980412.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206998271 + ... + 207101670.

It is an arithmetic number, because the mean of its divisors is an integer number (718877499312).

Almost surely, 2^{21408966949700} is an apocalyptic number.

21408966949700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21408966949700 is an abundant number, since it is smaller than the sum of its proper divisors (30350213000764).

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

21408966949700 is a wasteful number, since it uses less digits than its factorization.

21408966949700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414100013 (or 414100006 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 65.

The spelling of 21408966949700 in words is "twenty-one trillion, four hundred eight billion, nine hundred sixty-six million, nine hundred forty-nine thousand, seven hundred".