21000200000231 has 2 divisors, whose sum is σ = 21000200000232. Its totient is φ = 21000200000230.

The previous prime is 21000200000203. The next prime is 21000200000323. The reversal of 21000200000231 is 13200000200012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000200000231 is a prime.

It is a super-2 number, since 2×21000200000231² (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 (21000200090231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500100000115 + 10500100000116.

It is an arithmetic number, because the mean of its divisors is an integer number (10500100000116).

Almost surely, 2^{21000200000231} is an apocalyptic number.

21000200000231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000200000231 is an equidigital number, since it uses as much as digits as its factorization.

21000200000231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21000200000231 its reverse (13200000200012), we get a palindrome (34200200200243).

The spelling of 21000200000231 in words is "twenty-one trillion, two hundred million, two hundred thirty-one", and thus it is an aban number.