18122022221 has 8 divisors (see below), whose sum is σ = 18450581760. Its totient is φ = 17794176352.

The previous prime is 18122022209. The next prime is 18122022229. The reversal of 18122022221 is 12222022181.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18122022221 is a prime.

It is a super-3 number, since 3×18122022221³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122022229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127040 + ... + 228873.

It is an arithmetic number, because the mean of its divisors is an integer number (2306322720).

Almost surely, 2^18122022221 is an apocalyptic number.

It is an amenable number.

18122022221 is a deficient number, since it is larger than the sum of its proper divisors (328559539).

18122022221 is an equidigital number, since it uses as much as digits as its factorization.

18122022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356835.

The product of its (nonzero) digits is 512, while the sum is 23.

The spelling of 18122022221 in words is "eighteen billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty-one".