22121000001221 has 32 divisors (see below), whose sum is σ = 25820249548800. Its totient is φ = 18739393130880.

The previous prime is 22121000001193. The next prime is 22121000001223. The reversal of 22121000001221 is 12210000012122.

It is a cyclic number.

It is not a de Polignac number, because 22121000001221 - 2⁶ = 22121000001157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22121000001196 and 22121000001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121000001223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3623990 + ... + 7574648.

It is an arithmetic number, because the mean of its divisors is an integer number (806882798400).

Almost surely, 2^{22121000001221} is an apocalyptic number.

It is an amenable number.

22121000001221 is a deficient number, since it is larger than the sum of its proper divisors (3699249547579).

22121000001221 is a wasteful number, since it uses less digits than its factorization.

22121000001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951129.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22121000001221 its reverse (12210000012122), we get a palindrome (34331000013343).

The spelling of 22121000001221 in words is "twenty-two trillion, one hundred twenty-one billion, one thousand, two hundred twenty-one".