21425318908899 has 16 divisors (see below), whose sum is σ = 28580965241472. Its totient is φ = 14276610836928.

The previous prime is 21425318908897. The next prime is 21425318908907. The reversal of 21425318908899 is 99880981352412.

It is not a de Polignac number, because 21425318908899 - 2¹ = 21425318908897 is a prime.

It is a super-2 number, since 2×21425318908899² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21425318908897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55335672 + ... + 55721514.

It is an arithmetic number, because the mean of its divisors is an integer number (1786310327592).

Almost surely, 2^{21425318908899} is an apocalyptic number.

21425318908899 is a deficient number, since it is larger than the sum of its proper divisors (7155646332573).

21425318908899 is a wasteful number, since it uses less digits than its factorization.

21425318908899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394786.

The product of its (nonzero) digits is 89579520, while the sum is 69.

The spelling of 21425318908899 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred eighteen million, nine hundred eight thousand, eight hundred ninety-nine".