21200212101 has 4 divisors (see below), whose sum is σ = 28266949472. Its totient is φ = 14133474732.

The previous prime is 21200212043. The next prime is 21200212123. The reversal of 21200212101 is 10121200212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21200212101 - 2⁹ = 21200211589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200213101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3533368681 + ... + 3533368686.

It is an arithmetic number, because the mean of its divisors is an integer number (7066737368).

Almost surely, 2^21200212101 is an apocalyptic number.

It is an amenable number.

21200212101 is a deficient number, since it is larger than the sum of its proper divisors (7066737371).

21200212101 is an equidigital number, since it uses as much as digits as its factorization.

21200212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066737370.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21200212101 its reverse (10121200212), we get a palindrome (31321412313).

It can be divided in two parts, 21200212 and 101, that multiplied together give a palindrome (2141221412).

The spelling of 21200212101 in words is "twenty-one billion, two hundred million, two hundred twelve thousand, one hundred one".