1012121011221 has 8 divisors (see below), whose sum is σ = 1349567493120. Its totient is φ = 674710935072.

The previous prime is 1012121011201. The next prime is 1012121011229. The reversal of 1012121011221 is 1221101212101.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1012121011221 - 2¹⁴ = 1012120994837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1012121011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012121011229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9036501 + ... + 9147818.

It is an arithmetic number, because the mean of its divisors is an integer number (168695936640).

Almost surely, 2^{1012121011221} is an apocalyptic number.

It is an amenable number.

1012121011221 is a deficient number, since it is larger than the sum of its proper divisors (337446481899).

1012121011221 is a wasteful number, since it uses less digits than its factorization.

1012121011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18202875.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1012121011221 its reverse (1221101212101), we get a palindrome (2233222223322).

It can be divided in two parts, 101212101 and 1221, that multiplied together give a palindrome (123579975321).

The spelling of 1012121011221 in words is "one trillion, twelve billion, one hundred twenty-one million, eleven thousand, two hundred twenty-one".