21661741454100 has 144 divisors (see below), whose sum is σ = 68375844665856. Its totient is φ = 5251061552000.

The previous prime is 21661741454099. The next prime is 21661741454123. The reversal of 21661741454100 is 145414716612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68306905 + ... + 68623295.

It is an arithmetic number, because the mean of its divisors is an integer number (474832254624).

Almost surely, 2^{21661741454100} is an apocalyptic number.

21661741454100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21661741454100 is an abundant number, since it is smaller than the sum of its proper divisors (46714103211756).

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

21661741454100 is a wasteful number, since it uses less digits than its factorization.

21661741454100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337166 (or 337159 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 21661741454100 in words is "twenty-one trillion, six hundred sixty-one billion, seven hundred forty-one million, four hundred fifty-four thousand, one hundred".