21400222127 has 2 divisors, whose sum is σ = 21400222128. Its totient is φ = 21400222126.

The previous prime is 21400222091. The next prime is 21400222147. The reversal of 21400222127 is 72122200412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21400222127 - 2¹² = 21400218031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21400222147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700111063 + 10700111064.

It is an arithmetic number, because the mean of its divisors is an integer number (10700111064).

Almost surely, 2^21400222127 is an apocalyptic number.

21400222127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400222127 is an equidigital number, since it uses as much as digits as its factorization.

21400222127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 23.

Adding to 21400222127 its reverse (72122200412), we get a palindrome (93522422539).

The spelling of 21400222127 in words is "twenty-one billion, four hundred million, two hundred twenty-two thousand, one hundred twenty-seven".