21343116523 has 2 divisors, whose sum is σ = 21343116524. Its totient is φ = 21343116522.

The previous prime is 21343116511. The next prime is 21343116527. The reversal of 21343116523 is 32561134312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21343116523 - 2¹⁷ = 21342985451 is a prime.

It is not a weakly prime, because it can be changed into another prime (21343116527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671558261 + 10671558262.

It is an arithmetic number, because the mean of its divisors is an integer number (10671558262).

Almost surely, 2^21343116523 is an apocalyptic number.

21343116523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343116523 is an equidigital number, since it uses as much as digits as its factorization.

21343116523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The spelling of 21343116523 in words is "twenty-one billion, three hundred forty-three million, one hundred sixteen thousand, five hundred twenty-three".