1010101111221 has 16 divisors (see below), whose sum is σ = 1383636019904. Its totient is φ = 654994905984.

The previous prime is 1010101111213. The next prime is 1010101111223. The reversal of 1010101111221 is 1221111010101.

It is not a de Polignac number, because 1010101111221 - 2³ = 1010101111213 is a prime.

It is a super-2 number, since 2×1010101111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1010101111197 and 1010101111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010101111223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1073920 + ... + 1781433.

It is an arithmetic number, because the mean of its divisors is an integer number (86477251244).

Almost surely, 2^{1010101111221} is an apocalyptic number.

It is an amenable number.

1010101111221 is a deficient number, since it is larger than the sum of its proper divisors (373534908683).

1010101111221 is a wasteful number, since it uses less digits than its factorization.

1010101111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858580.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1010101111221 its reverse (1221111010101), we get a palindrome (2231212121322).

The spelling of 1010101111221 in words is "one trillion, ten billion, one hundred one million, one hundred eleven thousand, two hundred twenty-one".