11211121020 has 96 divisors (see below), whose sum is σ = 35425797120. Its totient is φ = 2624124160.

The previous prime is 11211121003. The next prime is 11211121063. The reversal of 11211121020 is 2012111211.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 11211120987 and 11211121005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 273732 + ... + 312011.

It is an arithmetic number, because the mean of its divisors is an integer number (369018720).

Almost surely, 2^11211121020 is an apocalyptic number.

11211121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211121020 is an abundant number, since it is smaller than the sum of its proper divisors (24214676100).

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

11211121020 is a wasteful number, since it uses less digits than its factorization.

11211121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585795 (or 585793 counting only the distinct ones).

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

Adding to 11211121020 its reverse (2012111211), we get a palindrome (13223232231).

It can be divided in two parts, 11211 and 121020, that added together give a palindrome (132231).

The spelling of 11211121020 in words is "eleven billion, two hundred eleven million, one hundred twenty-one thousand, twenty".