21212201202101 has 12 divisors (see below), whose sum is σ = 26573526781452. Its totient is φ = 16783280071488.

The previous prime is 21212201202097. The next prime is 21212201202103. The reversal of 21212201202101 is 10120210221212.

It can be written as a sum of positive squares in 2 ways, for example, as 13812446580100 + 7399754622001 = 3716510^2 + 2720249^2 .

It is not a de Polignac number, because 21212201202101 - 2² = 21212201202097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21212201202101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212201202103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16650078800 + ... + 16650080073.

It is an arithmetic number, because the mean of its divisors is an integer number (2214460565121).

Almost surely, 2^{21212201202101} is an apocalyptic number.

It is an amenable number.

21212201202101 is a deficient number, since it is larger than the sum of its proper divisors (5361325579351).

21212201202101 is a wasteful number, since it uses less digits than its factorization.

21212201202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33300158900 (or 33300158893 counting only the distinct ones).

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

Adding to 21212201202101 its reverse (10120210221212), we get a palindrome (31332411423313).

The spelling of 21212201202101 in words is "twenty-one trillion, two hundred twelve billion, two hundred one million, two hundred two thousand, one hundred one".