22121020212221 has 8 divisors (see below), whose sum is σ = 25297765552704. Its totient is φ = 18948424770720.

The previous prime is 22121020212197. The next prime is 22121020212253. The reversal of 22121020212221 is 12221202012122.

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-22121020212221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121020212193 and 22121020212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121020242221) 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, 1037463320 + ... + 1037484641.

It is an arithmetic number, because the mean of its divisors is an integer number (3162220694088).

Almost surely, 2^{22121020212221} is an apocalyptic number.

It is an amenable number.

22121020212221 is a deficient number, since it is larger than the sum of its proper divisors (3176745340483).

22121020212221 is a wasteful number, since it uses less digits than its factorization.

22121020212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074949491.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22121020212221 its reverse (12221202012122), we get a palindrome (34342222224343).

The spelling of 22121020212221 in words is "twenty-two trillion, one hundred twenty-one billion, twenty million, two hundred twelve thousand, two hundred twenty-one".