1012212102221 has 4 divisors (see below), whose sum is σ = 1012215329244. Its totient is φ = 1012208875200.

The previous prime is 1012212102179. The next prime is 1012212102263. The reversal of 1012212102221 is 1222012122101.

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

It is an interprime number because it is at equal distance from previous prime (1012212102179) and next prime (1012212102263).

It can be written as a sum of positive squares in 2 ways, for example, as 503823138025 + 508388964196 = 709805^2 + 713014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012212102221 - 2¹⁸ = 1012211840077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1012212102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012212102721) 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, 1085390 + ... + 1789551.

It is an arithmetic number, because the mean of its divisors is an integer number (253053832311).

Almost surely, 2^{1012212102221} is an apocalyptic number.

It is an amenable number.

1012212102221 is a deficient number, since it is larger than the sum of its proper divisors (3227023).

1012212102221 is an equidigital number, since it uses as much as digits as its factorization.

1012212102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227022.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1012212102221 its reverse (1222012122101), we get a palindrome (2234224224322).

The spelling of 1012212102221 in words is "one trillion, twelve billion, two hundred twelve million, one hundred two thousand, two hundred twenty-one".