21425399207699 has 24 divisors (see below), whose sum is σ = 22399395860400. Its totient is φ = 20491302730752.

The previous prime is 21425399207669. The next prime is 21425399207731. The reversal of 21425399207699 is 99670299352412.

It is not a de Polignac number, because 21425399207699 - 2¹⁶ = 21425399142163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21425399207669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161394719 + ... + 161527415.

It is an arithmetic number, because the mean of its divisors is an integer number (933308160850).

Almost surely, 2^{21425399207699} is an apocalyptic number.

21425399207699 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21425399207699 is a deficient number, since it is larger than the sum of its proper divisors (973996652701).

21425399207699 is a wasteful number, since it uses less digits than its factorization.

21425399207699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134567 (or 134538 counting only the distinct ones).

The product of its (nonzero) digits is 132269760, while the sum is 68.

The spelling of 21425399207699 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred ninety-nine million, two hundred seven thousand, six hundred ninety-nine".