21909114668925 has 144 divisors (see below), whose sum is σ = 43564292081856. Its totient is φ = 10436618880000.

The previous prime is 21909114668807. The next prime is 21909114668941. The reversal of 21909114668925 is 52986641190912.

21909114668925 is a `hidden beast` number, since 2 + 1 + 9 + 0 + 91 + 1 + 466 + 89 + 2 + 5 = 666.

It is not a de Polignac number, because 21909114668925 - 2¹⁹ = 21909114144637 is a prime.

It is a super-2 number, since 2×21909114668925² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 36887305 + ... + 37476545.

It is an arithmetic number, because the mean of its divisors is an integer number (302529806124).

Almost surely, 2^{21909114668925} is an apocalyptic number.

21909114668925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21909114668925 is a deficient number, since it is larger than the sum of its proper divisors (21655177412931).

21909114668925 is a wasteful number, since it uses less digits than its factorization.

21909114668925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589532 (or 589524 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 63.

The spelling of 21909114668925 in words is "twenty-one trillion, nine hundred nine billion, one hundred fourteen million, six hundred sixty-eight thousand, nine hundred twenty-five".