1011211011221 has 8 divisors (see below), whose sum is σ = 1014764520000. Its totient is φ = 1007663185440.

The previous prime is 1011211011193. The next prime is 1011211011233. The reversal of 1011211011221 is 1221101121101.

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

It is a cyclic number.

It is not a de Polignac number, because 1011211011221 - 2¹⁰ = 1011211010197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011211011196 and 1011211011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011211031221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064096 + ... + 1776153.

It is an arithmetic number, because the mean of its divisors is an integer number (126845565000).

Almost surely, 2^{1011211011221} is an apocalyptic number.

It is an amenable number.

1011211011221 is a deficient number, since it is larger than the sum of its proper divisors (3553508779).

1011211011221 is an equidigital number, since it uses as much as digits as its factorization.

1011211011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841499.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1011211011221 its reverse (1221101121101), we get a palindrome (2232312132322).

It can be divided in two parts, 101121101 and 1221, that multiplied together give a palindrome (123468864321).

The spelling of 1011211011221 in words is "one trillion, eleven billion, two hundred eleven million, eleven thousand, two hundred twenty-one".