21234628644511 has 2 divisors, whose sum is σ = 21234628644512. Its totient is φ = 21234628644510.

The previous prime is 21234628644469. The next prime is 21234628644611. The reversal of 21234628644511 is 11544682643212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21234628644511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234628644611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617314322255 + 10617314322256.

It is an arithmetic number, because the mean of its divisors is an integer number (10617314322256).

Almost surely, 2^{21234628644511} is an apocalyptic number.

21234628644511 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234628644511 is an equidigital number, since it uses as much as digits as its factorization.

21234628644511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2211840, while the sum is 49.

The spelling of 21234628644511 in words is "twenty-one trillion, two hundred thirty-four billion, six hundred twenty-eight million, six hundred forty-four thousand, five hundred eleven".