21214202201 has 4 divisors (see below), whose sum is σ = 21214728612. Its totient is φ = 21213675792.

The previous prime is 21214202173. The next prime is 21214202203. The reversal of 21214202201 is 10220241212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8126842201 + 13087360000 = 90149^2 + 114400^2 .

It is a cyclic number.

It is not a de Polignac number, because 21214202201 - 2³⁰ = 20140460377 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 21214202201.

It is not an unprimeable number, because it can be changed into a prime (21214202203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197246 + ... + 285191.

It is an arithmetic number, because the mean of its divisors is an integer number (5303682153).

Almost surely, 2^21214202201 is an apocalyptic number.

It is an amenable number.

21214202201 is a deficient number, since it is larger than the sum of its proper divisors (526411).

21214202201 is an equidigital number, since it uses as much as digits as its factorization.

21214202201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526410.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21214202201 its reverse (10220241212), we get a palindrome (31434443413).

The spelling of 21214202201 in words is "twenty-one billion, two hundred fourteen million, two hundred two thousand, two hundred one".