21665101436 has 48 divisors (see below), whose sum is σ = 43177736448. Its totient is φ = 9415507200.

The previous prime is 21665101429. The next prime is 21665101453. The reversal of 21665101436 is 63410156612.

It is a junction number, because it is equal to n+sod(n) for n = 21665101396 and 21665101405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4137476 + ... + 4142708.

It is an arithmetic number, because the mean of its divisors is an integer number (899536176).

Almost surely, 2^21665101436 is an apocalyptic number.

It is an amenable number.

21665101436 is a deficient number, since it is larger than the sum of its proper divisors (21512635012).

21665101436 is a wasteful number, since it uses less digits than its factorization.

21665101436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9362 (or 9360 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21665101436 in words is "twenty-one billion, six hundred sixty-five million, one hundred one thousand, four hundred thirty-six".