22121020001221 has 2 divisors, whose sum is σ = 22121020001222. Its totient is φ = 22121020001220.

The previous prime is 22121020001209. The next prime is 22121020001251. The reversal of 22121020001221 is 12210002012122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16486734468996 + 5634285532225 = 4060386^2 + 2373665^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121020001221 - 2¹⁷ = 22121019870149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121020001195 and 22121020001204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121020001251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060510000610 + 11060510000611.

It is an arithmetic number, because the mean of its divisors is an integer number (11060510000611).

Almost surely, 2^{22121020001221} is an apocalyptic number.

It is an amenable number.

22121020001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121020001221 is an equidigital number, since it uses as much as digits as its factorization.

22121020001221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 22121020001221 its reverse (12210002012122), we get a palindrome (34331022013343).

The spelling of 22121020001221 in words is "twenty-two trillion, one hundred twenty-one billion, twenty million, one thousand, two hundred twenty-one".