21212310127 has 2 divisors, whose sum is σ = 21212310128. Its totient is φ = 21212310126.

The previous prime is 21212310121. The next prime is 21212310137. The reversal of 21212310127 is 72101321212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212310127 is a prime.

It is a super-2 number, since 2×21212310127² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21212310098 and 21212310107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212310121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606155063 + 10606155064.

It is an arithmetic number, because the mean of its divisors is an integer number (10606155064).

Almost surely, 2^21212310127 is an apocalyptic number.

21212310127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212310127 is an equidigital number, since it uses as much as digits as its factorization.

21212310127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 21212310127 its reverse (72101321212), we get a palindrome (93313631339).

The spelling of 21212310127 in words is "twenty-one billion, two hundred twelve million, three hundred ten thousand, one hundred twenty-seven".