22121816635 has 4 divisors (see below), whose sum is σ = 26546179968. Its totient is φ = 17697453304.

The previous prime is 22121816621. The next prime is 22121816681. The reversal of 22121816635 is 53661812122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22121816635 - 2¹⁵ = 22121783867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121816594 and 22121816603.

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, 2212181659 + ... + 2212181668.

It is an arithmetic number, because the mean of its divisors is an integer number (6636544992).

Almost surely, 2^22121816635 is an apocalyptic number.

22121816635 is a deficient number, since it is larger than the sum of its proper divisors (4424363333).

22121816635 is an equidigital number, since it uses as much as digits as its factorization.

22121816635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424363332.

The product of its digits is 34560, while the sum is 37.

The spelling of 22121816635 in words is "twenty-two billion, one hundred twenty-one million, eight hundred sixteen thousand, six hundred thirty-five".