21013421342100 has 72 divisors (see below), whose sum is σ = 66325999010208. Its totient is φ = 5094162748800.

The previous prime is 21013421342059. The next prime is 21013421342203. The reversal of 21013421342100 is 124312431012.

It is a congruent number.

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, 3183848419 + ... + 3183855018.

Almost surely, 2^{21013421342100} is an apocalyptic number.

21013421342100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013421342100 is an abundant number, since it is smaller than the sum of its proper divisors (45312577668108).

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

21013421342100 is a wasteful number, since it uses less digits than its factorization.

21013421342100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6367703465 (or 6367703458 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21013421342100 its reverse (124312431012), we get a palindrome (21137733773112).

The spelling of 21013421342100 in words is "twenty-one trillion, thirteen billion, four hundred twenty-one million, three hundred forty-two thousand, one hundred".