21858678351 has 24 divisors (see below), whose sum is σ = 32372436096. Its totient is φ = 14205134160.

The previous prime is 21858678287. The next prime is 21858678379. The reversal of 21858678351 is 15387685812.

21858678351 is a `hidden beast` number, since 2 + 1 + 8 + 586 + 7 + 8 + 3 + 51 = 666.

It is not a de Polignac number, because 21858678351 - 2⁶ = 21858678287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21858674351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138516 + ... + 250806.

It is an arithmetic number, because the mean of its divisors is an integer number (1348851504).

Almost surely, 2^21858678351 is an apocalyptic number.

21858678351 is a deficient number, since it is larger than the sum of its proper divisors (10513757745).

21858678351 is a wasteful number, since it uses less digits than its factorization.

21858678351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112843 (or 112840 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 54.

The spelling of 21858678351 in words is "twenty-one billion, eight hundred fifty-eight million, six hundred seventy-eight thousand, three hundred fifty-one".