21634433635773 has 16 divisors (see below), whose sum is σ = 33020014123520. Its totient is φ = 12342561716016.

The previous prime is 21634433635697. The next prime is 21634433635817. The reversal of 21634433635773 is 37753633443612.

It is not a de Polignac number, because 21634433635773 - 2¹² = 21634433631677 is a prime.

It is a super-2 number, since 2×21634433635773² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21634433535773) 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, 832144615 + ... + 832170612.

It is an arithmetic number, because the mean of its divisors is an integer number (2063750882720).

Almost surely, 2^{21634433635773} is an apocalyptic number.

It is an amenable number.

21634433635773 is a deficient number, since it is larger than the sum of its proper divisors (11385580487747).

21634433635773 is a wasteful number, since it uses less digits than its factorization.

21634433635773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664315856.

The product of its digits is 68584320, while the sum is 57.

The spelling of 21634433635773 in words is "twenty-one trillion, six hundred thirty-four billion, four hundred thirty-three million, six hundred thirty-five thousand, seven hundred seventy-three".