21212233201331 has 4 divisors (see below), whose sum is σ = 21264096852600. Its totient is φ = 21160369550064.

The previous prime is 21212233201301. The next prime is 21212233201339. The reversal of 21212233201331 is 13310233221212.

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

It is a cyclic number.

It is not a de Polignac number, because 21212233201331 - 2⁶ = 21212233201267 is a prime.

It is a super-2 number, since 2×21212233201331² (a number of 27 digits) contains 22 as substring.

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 21212233201331.

It is not an unprimeable number, because it can be changed into a prime (21212233201339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25931825021 + ... + 25931825838.

It is an arithmetic number, because the mean of its divisors is an integer number (5316024213150).

Almost surely, 2^{21212233201331} is an apocalyptic number.

21212233201331 is a deficient number, since it is larger than the sum of its proper divisors (51863651269).

21212233201331 is an equidigital number, since it uses as much as digits as its factorization.

21212233201331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51863651268.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21212233201331 its reverse (13310233221212), we get a palindrome (34522466422543).

The spelling of 21212233201331 in words is "twenty-one trillion, two hundred twelve billion, two hundred thirty-three million, two hundred one thousand, three hundred thirty-one".