21766834508403 has 16 divisors (see below), whose sum is σ = 30284631521280. Its totient is φ = 13880144418624.

The previous prime is 21766834508401. The next prime is 21766834508413. The reversal of 21766834508403 is 30480543866712.

It is a happy number.

It is not a de Polignac number, because 21766834508403 - 2¹ = 21766834508401 is a prime.

It is a super-2 number, since 2×21766834508403² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21766834508401) 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, 4582903 + ... + 8033471.

It is an arithmetic number, because the mean of its divisors is an integer number (1892789470080).

Almost surely, 2^{21766834508403} is an apocalyptic number.

21766834508403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21766834508403 is a deficient number, since it is larger than the sum of its proper divisors (8517797012877).

21766834508403 is a wasteful number, since it uses less digits than its factorization.

21766834508403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3542018.

The product of its (nonzero) digits is 23224320, while the sum is 57.

The spelling of 21766834508403 in words is "twenty-one trillion, seven hundred sixty-six billion, eight hundred thirty-four million, five hundred eight thousand, four hundred three".