21331010201231 has 2 divisors, whose sum is σ = 21331010201232. Its totient is φ = 21331010201230.

The previous prime is 21331010201209. The next prime is 21331010201273. The reversal of 21331010201231 is 13210201013312.

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-21331010201231 is a prime.

It is a super-2 number, since 2×21331010201231² (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 (21331010209231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665505100615 + 10665505100616.

It is an arithmetic number, because the mean of its divisors is an integer number (10665505100616).

Almost surely, 2^{21331010201231} is an apocalyptic number.

21331010201231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331010201231 is an equidigital number, since it uses as much as digits as its factorization.

21331010201231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21331010201231 its reverse (13210201013312), we get a palindrome (34541211214543).

The spelling of 21331010201231 in words is "twenty-one trillion, three hundred thirty-one billion, ten million, two hundred one thousand, two hundred thirty-one".