21689883351 has 8 divisors (see below), whose sum is σ = 32133160560. Its totient is φ = 14459922216.

The previous prime is 21689883349. The next prime is 21689883359. The reversal of 21689883351 is 15338898612.

21689883351 is a `hidden beast` number, since 216 + 8 + 98 + 8 + 335 + 1 = 666.

It is not a de Polignac number, because 21689883351 - 2¹ = 21689883349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21689883359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401664480 + ... + 401664533.

It is an arithmetic number, because the mean of its divisors is an integer number (4016645070).

Almost surely, 2^21689883351 is an apocalyptic number.

21689883351 is a deficient number, since it is larger than the sum of its proper divisors (10443277209).

21689883351 is an equidigital number, since it uses as much as digits as its factorization.

21689883351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803329022 (or 803329016 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 21689883351 in words is "twenty-one billion, six hundred eighty-nine million, eight hundred eighty-three thousand, three hundred fifty-one".