21291677884320 has 96 divisors (see below), whose sum is σ = 67069433350080. Its totient is φ = 5677725911040.

The previous prime is 21291677884231. The next prime is 21291677884327. The reversal of 21291677884320 is 2348877619212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (21291677884327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83758371 + ... + 84012189.

It is an arithmetic number, because the mean of its divisors is an integer number (698639930730).

Almost surely, 2^{21291677884320} is an apocalyptic number.

21291677884320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21291677884320 is an abundant number, since it is smaller than the sum of its proper divisors (45777755465760).

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

21291677884320 is a wasteful number, since it uses less digits than its factorization.

21291677884320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428598 (or 428590 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 21291677884320 in words is "twenty-one trillion, two hundred ninety-one billion, six hundred seventy-seven million, eight hundred eighty-four thousand, three hundred twenty".