11211200020 has 12 divisors (see below), whose sum is σ = 23543520084. Its totient is φ = 4484480000.

The previous prime is 11211200009. The next prime is 11211200027. The reversal of 11211200020 is 2000211211.

It can be written as a sum of positive squares in 2 ways, for example, as 2834923536 + 8376276484 = 53244^2 + 91522^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211200027) 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, 280279981 + ... + 280280020.

It is an arithmetic number, because the mean of its divisors is an integer number (1961960007).

Almost surely, 2^11211200020 is an apocalyptic number.

11211200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211200020 is an abundant number, since it is smaller than the sum of its proper divisors (12332320064).

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

11211200020 is a wasteful number, since it uses less digits than its factorization.

11211200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560560010 (or 560560008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 11211200020 its reverse (2000211211), we get a palindrome (13211411231).

The spelling of 11211200020 in words is "eleven billion, two hundred eleven million, two hundred thousand, twenty".