21213122201 has 4 divisors (see below), whose sum is σ = 21213488400. Its totient is φ = 21212756004.

The previous prime is 21213122191. The next prime is 21213122209. The reversal of 21213122201 is 10222131212.

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 a cyclic number.

It is not a de Polignac number, because 21213122201 - 2¹⁴ = 21213105817 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 21213122201.

It is not an unprimeable number, because it can be changed into a prime (21213122209) 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, 74891 + ... + 219168.

It is an arithmetic number, because the mean of its divisors is an integer number (5303372100).

Almost surely, 2^21213122201 is an apocalyptic number.

It is an amenable number.

21213122201 is a deficient number, since it is larger than the sum of its proper divisors (366199).

21213122201 is an equidigital number, since it uses as much as digits as its factorization.

21213122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366198.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21213122201 its reverse (10222131212), we get a palindrome (31435253413).

The spelling of 21213122201 in words is "twenty-one billion, two hundred thirteen million, one hundred twenty-two thousand, two hundred one".