21102312443 has 2 divisors, whose sum is σ = 21102312444. Its totient is φ = 21102312442.

The previous prime is 21102312431. The next prime is 21102312457. The reversal of 21102312443 is 34421320112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102312443 - 2¹² = 21102308347 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102312943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551156221 + 10551156222.

It is an arithmetic number, because the mean of its divisors is an integer number (10551156222).

Almost surely, 2^21102312443 is an apocalyptic number.

21102312443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102312443 is an equidigital number, since it uses as much as digits as its factorization.

21102312443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21102312443 its reverse (34421320112), we get a palindrome (55523632555).

The spelling of 21102312443 in words is "twenty-one billion, one hundred two million, three hundred twelve thousand, four hundred forty-three".