10122281221 has 4 divisors (see below), whose sum is σ = 10900918252. Its totient is φ = 9343644192.

The previous prime is 10122281201. The next prime is 10122281243. The reversal of 10122281221 is 12218222101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12218222101 = 131 ⋅93268871.

It can be written as a sum of positive squares in 2 ways, for example, as 4110604996 + 6011676225 = 64114^2 + 77535^2 .

It is a cyclic number.

It is not a de Polignac number, because 10122281221 - 2⁷ = 10122281093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10122281192 and 10122281201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10122281201) 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, 389318496 + ... + 389318521.

It is an arithmetic number, because the mean of its divisors is an integer number (2725229563).

Almost surely, 2^10122281221 is an apocalyptic number.

It is an amenable number.

10122281221 is a deficient number, since it is larger than the sum of its proper divisors (778637031).

10122281221 is an equidigital number, since it uses as much as digits as its factorization.

10122281221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778637030.

The product of its (nonzero) digits is 256, while the sum is 22.

The spelling of 10122281221 in words is "ten billion, one hundred twenty-two million, two hundred eighty-one thousand, two hundred twenty-one".