22121022220001 has 4 divisors (see below), whose sum is σ = 22128393440004. Its totient is φ = 22113651000000.

The previous prime is 22121022219977. The next prime is 22121022220007. The reversal of 22121022220001 is 10002222012122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5836084808401 + 16284937411600 = 2415799^2 + 4035460^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121022220001 - 2³⁸ = 21846144313057 is a prime.

It is a super-5 number, since 5×22121022220001⁵ (a number of 68 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22121022220007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3685605500 + ... + 3685611501.

It is an arithmetic number, because the mean of its divisors is an integer number (5532098360001).

Almost surely, 2^{22121022220001} is an apocalyptic number.

It is an amenable number.

22121022220001 is a deficient number, since it is larger than the sum of its proper divisors (7371220003).

22121022220001 is an equidigital number, since it uses as much as digits as its factorization.

22121022220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7371220002.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22121022220001 its reverse (10002222012122), we get a palindrome (32123244232123).

The spelling of 22121022220001 in words is "twenty-two trillion, one hundred twenty-one billion, twenty-two million, two hundred twenty thousand, one".