1012212222121 has 4 divisors (see below), whose sum is σ = 1012222263492. Its totient is φ = 1012202180752.

The previous prime is 1012212222103. The next prime is 1012212222143. The reversal of 1012212222121 is 1212222122101.

1012212222121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221642282521 + 790569939600 = 470789^2 + 889140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012212222121 - 2³⁵ = 977852483753 is a prime.

It is a super-2 number, since 2×1012212222121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012212222421) 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, 4867930 + ... + 5071603.

It is an arithmetic number, because the mean of its divisors is an integer number (253055565873).

Almost surely, 2^{1012212222121} is an apocalyptic number.

It is an amenable number.

1012212222121 is a deficient number, since it is larger than the sum of its proper divisors (10041371).

1012212222121 is an equidigital number, since it uses as much as digits as its factorization.

1012212222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10041370.

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

Adding to 1012212222121 its reverse (1212222122101), we get a palindrome (2224434344222).

The spelling of 1012212222121 in words is "one trillion, twelve billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".