21259990145479 has 2 divisors, whose sum is σ = 21259990145480. Its totient is φ = 21259990145478.

The previous prime is 21259990145323. The next prime is 21259990145501. The reversal of 21259990145479 is 97454109995212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21259990145479 - 2³¹ = 21257842661831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21259990145179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10629995072739 + 10629995072740.

It is an arithmetic number, because the mean of its divisors is an integer number (10629995072740).

Almost surely, 2^{21259990145479} is an apocalyptic number.

21259990145479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21259990145479 is an equidigital number, since it uses as much as digits as its factorization.

21259990145479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73483200, while the sum is 67.

The spelling of 21259990145479 in words is "twenty-one trillion, two hundred fifty-nine billion, nine hundred ninety million, one hundred forty-five thousand, four hundred seventy-nine".