21212021102201 has 8 divisors (see below), whose sum is σ = 21502851364704. Its totient is φ = 20921197721760.

The previous prime is 21212021102171. The next prime is 21212021102269. The reversal of 21212021102201 is 10220112021212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21212021102201 - 2³⁰ = 21210947360377 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 21212021102201.

It is not an unprimeable number, because it can be changed into a prime (21212021182201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4646606 + ... + 8000936.

It is an arithmetic number, because the mean of its divisors is an integer number (2687856420588).

Almost surely, 2^{21212021102201} is an apocalyptic number.

It is an amenable number.

21212021102201 is a deficient number, since it is larger than the sum of its proper divisors (290830262503).

21212021102201 is an equidigital number, since it uses as much as digits as its factorization.

21212021102201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3441031.

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

Adding to 21212021102201 its reverse (10220112021212), we get a palindrome (31432133123413).

The spelling of 21212021102201 in words is "twenty-one trillion, two hundred twelve billion, twenty-one million, one hundred two thousand, two hundred one".