1220121010011 has 4 divisors (see below), whose sum is σ = 1626828013352. Its totient is φ = 813414006672.

The previous prime is 1220121010001. The next prime is 1220121010019. The reversal of 1220121010011 is 1100101210221.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1220121010011 - 2¹⁰ = 1220121008987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220121010019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203353501666 + ... + 203353501671.

It is an arithmetic number, because the mean of its divisors is an integer number (406707003338).

Almost surely, 2^{1220121010011} is an apocalyptic number.

1220121010011 is a deficient number, since it is larger than the sum of its proper divisors (406707003341).

1220121010011 is an equidigital number, since it uses as much as digits as its factorization.

1220121010011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406707003340.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1220121010011 its reverse (1100101210221), we get a palindrome (2320222220232).

It can be divided in two parts, 12201210 and 10011, that added together give a palindrome (12211221).

The spelling of 1220121010011 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, ten thousand, eleven".