21021223122827 has 2 divisors, whose sum is σ = 21021223122828. Its totient is φ = 21021223122826.

The previous prime is 21021223122791. The next prime is 21021223123037. The reversal of 21021223122827 is 72822132212012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021223122827 - 2¹⁰ = 21021223121803 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021223122127) 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, 10510611561413 + 10510611561414.

It is an arithmetic number, because the mean of its divisors is an integer number (10510611561414).

Almost surely, 2^{21021223122827} is an apocalyptic number.

21021223122827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021223122827 is an equidigital number, since it uses as much as digits as its factorization.

21021223122827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 35.

Adding to 21021223122827 its reverse (72822132212012), we get a palindrome (93843355334839).

The spelling of 21021223122827 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-three million, one hundred twenty-two thousand, eight hundred twenty-seven".