22121201210221 has 8 divisors (see below), whose sum is σ = 23441506497720. Its totient is φ = 20803013495808.

The previous prime is 22121201210201. The next prime is 22121201210231. The reversal of 22121201210221 is 12201210212122.

It can be written as a sum of positive squares in 4 ways, for example, as 15640047562500 + 6481153647721 = 3954750^2 + 2545811^2 .

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

It is not a de Polignac number, because 22121201210221 - 2¹¹ = 22121201208173 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 (22121201210201) 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, 529371756 + ... + 529413541.

It is an arithmetic number, because the mean of its divisors is an integer number (2930188312215).

Almost surely, 2^{22121201210221} is an apocalyptic number.

It is an amenable number.

22121201210221 is a deficient number, since it is larger than the sum of its proper divisors (1320305287499).

22121201210221 is a wasteful number, since it uses less digits than its factorization.

22121201210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058786543.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 22121201210221 its reverse (12201210212122), we get a palindrome (34322411422343).

The spelling of 22121201210221 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred one million, two hundred ten thousand, two hundred twenty-one".