18022031222021 has 4 divisors (see below), whose sum is σ = 18022039873632. Its totient is φ = 18022022570412.

The previous prime is 18022031221991. The next prime is 18022031222029. The reversal of 18022031222021 is 12022213022081.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18022031222021 - 2³⁸ = 17747153315077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18022031222029) 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, 916406 + ... + 6073208.

It is an arithmetic number, because the mean of its divisors is an integer number (4505509968408).

Almost surely, 2^{18022031222021} is an apocalyptic number.

It is an amenable number.

18022031222021 is a deficient number, since it is larger than the sum of its proper divisors (8651611).

18022031222021 is an equidigital number, since it uses as much as digits as its factorization.

18022031222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8651610.

The product of its (nonzero) digits is 1536, while the sum is 26.

The spelling of 18022031222021 in words is "eighteen trillion, twenty-two billion, thirty-one million, two hundred twenty-two thousand, twenty-one".