11211220000 has 60 divisors (see below), whose sum is σ = 27581332086. Its totient is φ = 4484480000.

The previous prime is 11211219977. The next prime is 11211220003. The reversal of 11211220000 is 2211211.

It can be written as a sum of positive squares in 5 ways, for example, as 6574096 + 11204645904 = 2564^2 + 105852^2 .

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

It is not an unprimeable number, because it can be changed into a prime (11211220003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 260281 + ... + 300280.

Almost surely, 2^11211220000 is an apocalyptic number.

11211220000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211220000 is an abundant number, since it is smaller than the sum of its proper divisors (16370112086).

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

11211220000 is an frugal number, since it uses more digits than its factorization.

11211220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560591 (or 560568 counting only the distinct ones).

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

Adding to 11211220000 its reverse (2211211), we get a palindrome (11213431211).

The spelling of 11211220000 in words is "eleven billion, two hundred eleven million, two hundred twenty thousand".