21460907889 has 6 divisors (see below), whose sum is σ = 30999089186. Its totient is φ = 14307271920.

The previous prime is 21460907861. The next prime is 21460907893. The reversal of 21460907889 is 98870906412.

21460907889 is a `hidden beast` number, since 21 + 4 + 609 + 0 + 7 + 8 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21029930289 + 430977600 = 145017^2 + 20760^2 .

It is not a de Polignac number, because 21460907889 - 2¹¹ = 21460905841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21460907989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1192272652 + ... + 1192272669.

Almost surely, 2^21460907889 is an apocalyptic number.

It is an amenable number.

21460907889 is a deficient number, since it is larger than the sum of its proper divisors (9538181297).

21460907889 is a wasteful number, since it uses less digits than its factorization.

21460907889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384545327 (or 2384545324 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 21460907889 in words is "twenty-one billion, four hundred sixty million, nine hundred seven thousand, eight hundred eighty-nine".