21110020231 has 2 divisors, whose sum is σ = 21110020232. Its totient is φ = 21110020230.

The previous prime is 21110020159. The next prime is 21110020277. The reversal of 21110020231 is 13202001112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21110020231 - 2¹¹ = 21110018183 is a prime.

It is a super-3 number, since 3×21110020231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110029231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555010115 + 10555010116.

It is an arithmetic number, because the mean of its divisors is an integer number (10555010116).

Almost surely, 2^21110020231 is an apocalyptic number.

21110020231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110020231 is an equidigital number, since it uses as much as digits as its factorization.

21110020231 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 13.

Adding to 21110020231 its reverse (13202001112), we get a palindrome (34312021343).

The spelling of 21110020231 in words is "twenty-one billion, one hundred ten million, twenty thousand, two hundred thirty-one".