1121010101221 has 4 divisors (see below), whose sum is σ = 1121463403372. Its totient is φ = 1120556799072.

The previous prime is 1121010101219. The next prime is 1121010101231. The reversal of 1121010101221 is 1221010101211.

It is a happy number.

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 1003713441025 + 117296660196 = 1001855^2 + 342486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121010101221 - 2¹ = 1121010101219 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 (1121010101231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226647366 + ... + 226652311.

It is an arithmetic number, because the mean of its divisors is an integer number (280365850843).

Almost surely, 2^{1121010101221} is an apocalyptic number.

It is an amenable number.

1121010101221 is a deficient number, since it is larger than the sum of its proper divisors (453302151).

1121010101221 is an equidigital number, since it uses as much as digits as its factorization.

1121010101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453302150.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1121010101221 its reverse (1221010101211), we get a palindrome (2342020202432).

The spelling of 1121010101221 in words is "one trillion, one hundred twenty-one billion, ten million, one hundred one thousand, two hundred twenty-one".