21212200000231 has 2 divisors, whose sum is σ = 21212200000232. Its totient is φ = 21212200000230.

The previous prime is 21212200000177. The next prime is 21212200000261. The reversal of 21212200000231 is 13200000221212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21212200000231 - 2²⁷ = 21212065782503 is a prime.

It is a super-2 number, since 2×21212200000231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212200000261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606100000115 + 10606100000116.

It is an arithmetic number, because the mean of its divisors is an integer number (10606100000116).

Almost surely, 2^{21212200000231} is an apocalyptic number.

21212200000231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212200000231 is an equidigital number, since it uses as much as digits as its factorization.

21212200000231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21212200000231 its reverse (13200000221212), we get a palindrome (34412200221443).

The spelling of 21212200000231 in words is "twenty-one trillion, two hundred twelve billion, two hundred million, two hundred thirty-one", and thus it is an aban number.