21665133622 has 8 divisors (see below), whose sum is σ = 35452036872. Its totient is φ = 9847788000.

The previous prime is 21665133619. The next prime is 21665133673. The reversal of 21665133622 is 22633156612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21665133622² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492389379 + ... + 492389422.

It is an arithmetic number, because the mean of its divisors is an integer number (4431504609).

Almost surely, 2^21665133622 is an apocalyptic number.

21665133622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21665133622 is a deficient number, since it is larger than the sum of its proper divisors (13786903250).

21665133622 is a wasteful number, since it uses less digits than its factorization.

21665133622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984778814.

The product of its digits is 77760, while the sum is 37.

The spelling of 21665133622 in words is "twenty-one billion, six hundred sixty-five million, one hundred thirty-three thousand, six hundred twenty-two".