21425390819123 has 2 divisors, whose sum is σ = 21425390819124. Its totient is φ = 21425390819122.

The previous prime is 21425390819099. The next prime is 21425390819143. The reversal of 21425390819123 is 32191809352412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21425390819123 - 2¹⁶ = 21425390753587 is a prime.

It is not a weakly prime, because it can be changed into another prime (21425390819143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712695409561 + 10712695409562.

It is an arithmetic number, because the mean of its divisors is an integer number (10712695409562).

Almost surely, 2^{21425390819123} is an apocalyptic number.

21425390819123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21425390819123 is an equidigital number, since it uses as much as digits as its factorization.

21425390819123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 21425390819123 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred ninety million, eight hundred nineteen thousand, one hundred twenty-three".