21212202127 has 2 divisors, whose sum is σ = 21212202128. Its totient is φ = 21212202126.

The previous prime is 21212202101. The next prime is 21212202173. The reversal of 21212202127 is 72120221212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21212202127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212202098 and 21212202107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212202227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606101063 + 10606101064.

It is an arithmetic number, because the mean of its divisors is an integer number (10606101064).

Almost surely, 2^21212202127 is an apocalyptic number.

21212202127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212202127 is an equidigital number, since it uses as much as digits as its factorization.

21212202127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 21212202127 its reverse (72120221212), we get a palindrome (93332423339).

The spelling of 21212202127 in words is "twenty-one billion, two hundred twelve million, two hundred two thousand, one hundred twenty-seven".