21433440189 has 16 divisors (see below), whose sum is σ = 32771958912. Its totient is φ = 12205875648.

The previous prime is 21433440187. The next prime is 21433440191. The reversal of 21433440189 is 98104433412.

It is an interprime number because it is at equal distance from previous prime (21433440187) and next prime (21433440191).

It is not a de Polignac number, because 21433440189 - 2¹ = 21433440187 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433440187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1735554 + ... + 1747859.

It is an arithmetic number, because the mean of its divisors is an integer number (2048247432).

Almost surely, 2^21433440189 is an apocalyptic number.

It is an amenable number.

21433440189 is a deficient number, since it is larger than the sum of its proper divisors (11338518723).

21433440189 is a wasteful number, since it uses less digits than its factorization.

21433440189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483716.

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 21433440189 in words is "twenty-one billion, four hundred thirty-three million, four hundred forty thousand, one hundred eighty-nine".