21673535943 has 16 divisors (see below), whose sum is σ = 30670642656. Its totient is φ = 13566766080.

The previous prime is 21673535929. The next prime is 21673535957. The reversal of 21673535943 is 34953537612.

It is an interprime number because it is at equal distance from previous prime (21673535929) and next prime (21673535957).

It is not a de Polignac number, because 21673535943 - 2¹⁶ = 21673470407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21673535892 and 21673535901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21673535963) 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, 483246 + ... + 526187.

It is an arithmetic number, because the mean of its divisors is an integer number (1916915166).

Almost surely, 2^21673535943 is an apocalyptic number.

21673535943 is a deficient number, since it is larger than the sum of its proper divisors (8997106713).

21673535943 is a wasteful number, since it uses less digits than its factorization.

21673535943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009874.

The product of its digits is 2041200, while the sum is 48.

The spelling of 21673535943 in words is "twenty-one billion, six hundred seventy-three million, five hundred thirty-five thousand, nine hundred forty-three".