11211220121020 has 48 divisors (see below), whose sum is σ = 23691933528480. Its totient is φ = 4456235990016.

The previous prime is 11211220120987. The next prime is 11211220121071. The reversal of 11211220121020 is 2012102211211.

11211220121020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 11211220120985 and 11211220121003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19567744 + ... + 20132536.

It is an arithmetic number, because the mean of its divisors is an integer number (493581948510).

Almost surely, 2^{11211220121020} is an apocalyptic number.

11211220121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211220121020 is an abundant number, since it is smaller than the sum of its proper divisors (12480713407460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11211220121020 is a wasteful number, since it uses less digits than its factorization.

11211220121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571054 (or 571052 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11211220121020 its reverse (2012102211211), we get a palindrome (13223322332231).

The spelling of 11211220121020 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, twenty".