21677816433 has 144 divisors (see below), whose sum is σ = 38891260800. Its totient is φ = 10670958144.

The previous prime is 21677816429. The next prime is 21677816437. The reversal of 21677816433 is 33461877612.

It is an interprime number because it is at equal distance from previous prime (21677816429) and next prime (21677816437).

It is not a de Polignac number, because 21677816433 - 2² = 21677816429 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21677816437) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 323549466 + ... + 323549532.

It is an arithmetic number, because the mean of its divisors is an integer number (270078200).

Almost surely, 2^21677816433 is an apocalyptic number.

It is an amenable number.

21677816433 is a deficient number, since it is larger than the sum of its proper divisors (17213444367).

21677816433 is an equidigital number, since it uses as much as digits as its factorization.

21677816433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 109 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 48.

The spelling of 21677816433 in words is "twenty-one billion, six hundred seventy-seven million, eight hundred sixteen thousand, four hundred thirty-three".