1012121222221 has 4 divisors (see below), whose sum is σ = 1025985896572. Its totient is φ = 998256547872.

The previous prime is 1012121222141. The next prime is 1012121222227. The reversal of 1012121222221 is 1222221212101.

1012121222221 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 770991119721 + 241130102500 = 878061^2 + 491050^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012121222221 - 2⁷ = 1012121222093 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 (1012121222227) 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, 6932337066 + ... + 6932337211.

It is an arithmetic number, because the mean of its divisors is an integer number (256496474143).

Almost surely, 2^{1012121222221} is an apocalyptic number.

It is an amenable number.

1012121222221 is a deficient number, since it is larger than the sum of its proper divisors (13864674351).

1012121222221 is an equidigital number, since it uses as much as digits as its factorization.

1012121222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13864674350.

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

Adding to 1012121222221 its reverse (1222221212101), we get a palindrome (2234342434322).

The spelling of 1012121222221 in words is "one trillion, twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".