21788416890 has 48 divisors (see below), whose sum is σ = 56738411496. Its totient is φ = 5801164800.

The previous prime is 21788416889. The next prime is 21788416891. The reversal of 21788416890 is 9861488712.

21788416890 is a `hidden beast` number, since 217 + 8 + 8 + 416 + 8 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21788416889) and next prime (21788416891).

It can be written as a sum of positive squares in 4 ways, for example, as 19667538081 + 2120878809 = 140241^2 + 46053^2 .

It is a super-2 number, since 2×21788416890² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21788416891) 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, 131151 + ... + 246530.

Almost surely, 2^21788416890 is an apocalyptic number.

21788416890 is an abundant number, since it is smaller than the sum of its proper divisors (34949994606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21788416890 is a wasteful number, since it uses less digits than its factorization.

21788416890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378335 (or 378332 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 21788416890 in words is "twenty-one billion, seven hundred eighty-eight million, four hundred sixteen thousand, eight hundred ninety".