10222220212121 has 4 divisors (see below), whose sum is σ = 10222232141412. Its totient is φ = 10222208282832.

The previous prime is 10222220212037. The next prime is 10222220212129. The reversal of 10222220212121 is 12121202222201.

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 3915692973721 + 6306527238400 = 1978811^2 + 2511280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10222220212121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10222220212093 and 10222220212102.

It is not an unprimeable number, because it can be changed into a prime (10222220212129) 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, 4570706 + ... + 6429291.

It is an arithmetic number, because the mean of its divisors is an integer number (2555558035353).

Almost surely, 2^{10222220212121} is an apocalyptic number.

It is an amenable number.

10222220212121 is a deficient number, since it is larger than the sum of its proper divisors (11929291).

10222220212121 is an equidigital number, since it uses as much as digits as its factorization.

10222220212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11929290.

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

Adding to 10222220212121 its reverse (12121202222201), we get a palindrome (22343422434322).

The spelling of 10222220212121 in words is "ten trillion, two hundred twenty-two billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".