1012122100221 has 4 divisors (see below), whose sum is σ = 1349496133632. Its totient is φ = 674748066812.

The previous prime is 1012122100219. The next prime is 1012122100247. The reversal of 1012122100221 is 1220012212101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1012122100221 - 2¹ = 1012122100219 is a prime.

It is a super-2 number, since 2×1012122100221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1012122100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012122107221) 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, 168687016701 + ... + 168687016706.

It is an arithmetic number, because the mean of its divisors is an integer number (337374033408).

Almost surely, 2^{1012122100221} is an apocalyptic number.

It is an amenable number.

1012122100221 is a deficient number, since it is larger than the sum of its proper divisors (337374033411).

1012122100221 is an equidigital number, since it uses as much as digits as its factorization.

1012122100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337374033410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1012122100221 its reverse (1220012212101), we get a palindrome (2232134312322).

The spelling of 1012122100221 in words is "one trillion, twelve billion, one hundred twenty-two million, one hundred thousand, two hundred twenty-one".