21142103402309 has 2 divisors, whose sum is σ = 21142103402310. Its totient is φ = 21142103402308.

The previous prime is 21142103402293. The next prime is 21142103402317. The reversal of 21142103402309 is 90320430124112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13491883996900 + 7650219405409 = 3673130^2 + 2765903^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142103402309 - 2⁴ = 21142103402293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142103402209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571051701154 + 10571051701155.

It is an arithmetic number, because the mean of its divisors is an integer number (10571051701155).

Almost surely, 2^{21142103402309} is an apocalyptic number.

It is an amenable number.

21142103402309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142103402309 is an equidigital number, since it uses as much as digits as its factorization.

21142103402309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21142103402309 in words is "twenty-one trillion, one hundred forty-two billion, one hundred three million, four hundred two thousand, three hundred nine".