21145743103 has 2 divisors, whose sum is σ = 21145743104. Its totient is φ = 21145743102.

The previous prime is 21145743067. The next prime is 21145743121. The reversal of 21145743103 is 30134754112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21145743103 - 2⁹ = 21145742591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145749103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572871551 + 10572871552.

It is an arithmetic number, because the mean of its divisors is an integer number (10572871552).

Almost surely, 2^21145743103 is an apocalyptic number.

21145743103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145743103 is an equidigital number, since it uses as much as digits as its factorization.

21145743103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 21145743103 in words is "twenty-one billion, one hundred forty-five million, seven hundred forty-three thousand, one hundred three".