21012221434300 has 18 divisors (see below), whose sum is σ = 45596520512648. Its totient is φ = 8404888573680.

The previous prime is 21012221434297. The next prime is 21012221434307. The reversal of 21012221434300 is 343412221012.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012221434307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105061107072 + ... + 105061107271.

Almost surely, 2^{21012221434300} is an apocalyptic number.

21012221434300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012221434300 is an abundant number, since it is smaller than the sum of its proper divisors (24584299078348).

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

21012221434300 is a wasteful number, since it uses less digits than its factorization.

21012221434300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210122214357 (or 210122214350 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21012221434300 its reverse (343412221012), we get a palindrome (21355633655312).

The spelling of 21012221434300 in words is "twenty-one trillion, twelve billion, two hundred twenty-one million, four hundred thirty-four thousand, three hundred".