1011101212221 has 16 divisors (see below), whose sum is σ = 1352220949248. Its totient is φ = 672024729600.

The previous prime is 1011101212151. The next prime is 1011101212237. The reversal of 1011101212221 is 1222121011101.

It is a happy number.

It is not a de Polignac number, because 1011101212221 - 2¹⁷ = 1011101081149 is a prime.

It is a super-2 number, since 2×1011101212221² (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 1011101212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011101212291) 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, 30557116 + ... + 30590186.

It is an arithmetic number, because the mean of its divisors is an integer number (84513809328).

Almost surely, 2^{1011101212221} is an apocalyptic number.

It is an amenable number.

1011101212221 is a deficient number, since it is larger than the sum of its proper divisors (341119737027).

1011101212221 is a wasteful number, since it uses less digits than its factorization.

1011101212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63652.

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

Adding to 1011101212221 its reverse (1222121011101), we get a palindrome (2233222223322).

The spelling of 1011101212221 in words is "one trillion, eleven billion, one hundred one million, two hundred twelve thousand, two hundred twenty-one".