21284093907 has 6 divisors (see below), whose sum is σ = 30743691212. Its totient is φ = 14189395932.

The previous prime is 21284093843. The next prime is 21284093927. The reversal of 21284093907 is 70939048212.

21284093907 is a `hidden beast` number, since 212 + 8 + 40 + 9 + 390 + 7 = 666.

It is not a de Polignac number, because 21284093907 - 2⁶ = 21284093843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21284093927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1182449653 + ... + 1182449670.

Almost surely, 2^21284093907 is an apocalyptic number.

21284093907 is a deficient number, since it is larger than the sum of its proper divisors (9459597305).

21284093907 is a wasteful number, since it uses less digits than its factorization.

21284093907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2364899329 (or 2364899326 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 21284093907 in words is "twenty-one billion, two hundred eighty-four million, ninety-three thousand, nine hundred seven".