21200221019973 has 16 divisors (see below), whose sum is σ = 29250510909120. Its totient is φ = 13642000130304.

The previous prime is 21200221019921. The next prime is 21200221019987. The reversal of 21200221019973 is 37991012200212.

It is a happy number.

It is not a de Polignac number, because 21200221019973 - 2¹⁷ = 21200220888901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200221019273) 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, 36488211 + ... + 37064672.

It is an arithmetic number, because the mean of its divisors is an integer number (1828156931820).

Almost surely, 2^{21200221019973} is an apocalyptic number.

It is an amenable number.

21200221019973 is a deficient number, since it is larger than the sum of its proper divisors (8050289889147).

21200221019973 is a wasteful number, since it uses less digits than its factorization.

21200221019973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73556228.

The product of its (nonzero) digits is 27216, while the sum is 39.

The spelling of 21200221019973 in words is "twenty-one trillion, two hundred billion, two hundred twenty-one million, nineteen thousand, nine hundred seventy-three".