22011256121 has 4 divisors (see below), whose sum is σ = 22015578000. Its totient is φ = 22006934244.

The previous prime is 22011256117. The next prime is 22011256159. The reversal of 22011256121 is 12165211022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22011256121 - 2² = 22011256117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22011256321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2153291 + ... + 2163488.

It is an arithmetic number, because the mean of its divisors is an integer number (5503894500).

Almost surely, 2^22011256121 is an apocalyptic number.

It is an amenable number.

22011256121 is a deficient number, since it is larger than the sum of its proper divisors (4321879).

22011256121 is an equidigital number, since it uses as much as digits as its factorization.

22011256121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4321878.

The product of its (nonzero) digits is 480, while the sum is 23.

Adding to 22011256121 its reverse (12165211022), we get a palindrome (34176467143).

The spelling of 22011256121 in words is "twenty-two billion, eleven million, two hundred fifty-six thousand, one hundred twenty-one".