1011211211121 has 8 divisors (see below), whose sum is σ = 1384721658624. Its totient is φ = 655920785520.

The previous prime is 1011211211119. The next prime is 1011211211141. The reversal of 1011211211121 is 1211121121101.

1011211211121 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1011211211121 - 2¹ = 1011211211119 is a prime.

It is a super-2 number, since 2×1011211211121² (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 1011211211121.

It is not an unprimeable number, because it can be changed into a prime (1011211211141) 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, 4555005345 + ... + 4555005566.

It is an arithmetic number, because the mean of its divisors is an integer number (173090207328).

Almost surely, 2^{1011211211121} is an apocalyptic number.

It is an amenable number.

1011211211121 is a deficient number, since it is larger than the sum of its proper divisors (373510447503).

1011211211121 is an equidigital number, since it uses as much as digits as its factorization.

1011211211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9110010951.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1011211211121 its reverse (1211121121101), we get a palindrome (2222332332222).

The spelling of 1011211211121 in words is "one trillion, eleven billion, two hundred eleven million, two hundred eleven thousand, one hundred twenty-one".