21234628644611 has 2 divisors, whose sum is σ = 21234628644612. Its totient is φ = 21234628644610.

The previous prime is 21234628644511. The next prime is 21234628644629. The reversal of 21234628644611 is 11644682643212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21234628644611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21234628644611.

It is not a weakly prime, because it can be changed into another prime (21234628644631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617314322305 + 10617314322306.

It is an arithmetic number, because the mean of its divisors is an integer number (10617314322306).

Almost surely, 2^{21234628644611} is an apocalyptic number.

21234628644611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234628644611 is an equidigital number, since it uses as much as digits as its factorization.

21234628644611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 50.

The spelling of 21234628644611 in words is "twenty-one trillion, two hundred thirty-four billion, six hundred twenty-eight million, six hundred forty-four thousand, six hundred eleven".