21151145443 has 2 divisors, whose sum is σ = 21151145444. Its totient is φ = 21151145442.

The previous prime is 21151145419. The next prime is 21151145567. The reversal of 21151145443 is 34454115112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21151145443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21151145243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575572721 + 10575572722.

It is an arithmetic number, because the mean of its divisors is an integer number (10575572722).

Almost surely, 2^21151145443 is an apocalyptic number.

21151145443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21151145443 is an equidigital number, since it uses as much as digits as its factorization.

21151145443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 31.

The spelling of 21151145443 in words is "twenty-one billion, one hundred fifty-one million, one hundred forty-five thousand, four hundred forty-three".