21200212212101 has 16 divisors (see below), whose sum is σ = 22851469738944. Its totient is φ = 19551881067264.

The previous prime is 21200212212061. The next prime is 21200212212107. The reversal of 21200212212101 is 10121221200212.

It is not a de Polignac number, because 21200212212101 - 2¹⁰ = 21200212211077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21200212212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200212212107) 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, 523661606 + ... + 523702088.

It is an arithmetic number, because the mean of its divisors is an integer number (1428216858684).

Almost surely, 2^{21200212212101} is an apocalyptic number.

It is an amenable number.

21200212212101 is a deficient number, since it is larger than the sum of its proper divisors (1651257526843).

21200212212101 is a wasteful number, since it uses less digits than its factorization.

21200212212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75620.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21200212212101 its reverse (10121221200212), we get a palindrome (31321433412313).

The spelling of 21200212212101 in words is "twenty-one trillion, two hundred billion, two hundred twelve million, two hundred twelve thousand, one hundred one".