22001221120021 has 8 divisors (see below), whose sum is σ = 25847588448864. Its totient is φ = 18462563177520.

The previous prime is 22001221120003. The next prime is 22001221120051. The reversal of 22001221120021 is 12002112210022.

It is a happy number.

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

It is not a de Polignac number, because 22001221120021 - 2²¹ = 22001219022869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22001221119977 and 22001221120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001221120051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76927346431 + ... + 76927346716.

It is an arithmetic number, because the mean of its divisors is an integer number (3230948556108).

Almost surely, 2^{22001221120021} is an apocalyptic number.

It is an amenable number.

22001221120021 is a deficient number, since it is larger than the sum of its proper divisors (3846367328843).

22001221120021 is a wasteful number, since it uses less digits than its factorization.

22001221120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153854693171.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22001221120021 its reverse (12002112210022), we get a palindrome (34003333330043).

The spelling of 22001221120021 in words is "twenty-two trillion, one billion, two hundred twenty-one million, one hundred twenty thousand, twenty-one".