11211210020 has 24 divisors (see below), whose sum is σ = 23597932344. Its totient is φ = 4474123776.

The previous prime is 11211210019. The next prime is 11211210037. The reversal of 11211210020 is 2001211211.

It can be written as a sum of positive squares in 4 ways, for example, as 1046134336 + 10165075684 = 32344^2 + 100822^2 .

It is a super-2 number, since 2×11211210020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11211209983 and 11211210010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638639 + ... + 655958.

It is an arithmetic number, because the mean of its divisors is an integer number (983247181).

Almost surely, 2^11211210020 is an apocalyptic number.

11211210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211210020 is an abundant number, since it is smaller than the sum of its proper divisors (12386722324).

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

11211210020 is a wasteful number, since it uses less digits than its factorization.

11211210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295039 (or 1295037 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11211210020 its reverse (2001211211), we get a palindrome (13212421231).

The spelling of 11211210020 in words is "eleven billion, two hundred eleven million, two hundred ten thousand, twenty".