21425251920309 has 24 divisors (see below), whose sum is σ = 32577001891200. Its totient is φ = 13531490709120.

The previous prime is 21425251920253. The next prime is 21425251920383. The reversal of 21425251920309 is 90302915252412.

21425251920309 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 5 + 251 + 92 + 0 + 309 = 666.

It is not a de Polignac number, because 21425251920309 - 2¹¹ = 21425251918261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21425251924309) 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, 8472772 + ... + 10706930.

It is an arithmetic number, because the mean of its divisors is an integer number (1357375078800).

Almost surely, 2^{21425251920309} is an apocalyptic number.

It is an amenable number.

21425251920309 is a deficient number, since it is larger than the sum of its proper divisors (11151749970891).

21425251920309 is a wasteful number, since it uses less digits than its factorization.

21425251920309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290265 (or 2290262 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 21425251920309 in words is "twenty-one trillion, four hundred twenty-five billion, two hundred fifty-one million, nine hundred twenty thousand, three hundred nine".