11211021221020 has 24 divisors (see below), whose sum is σ = 23568762823200. Its totient is φ = 4479528820032.

The previous prime is 11211021221011. The next prime is 11211021221077. The reversal of 11211021221020 is 2012212011211.

It is a junction number, because it is equal to n+sod(n) for n = 11211021220985 and 11211021221003.

It is a congruent number.

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, 304960435 + ... + 304997194.

It is an arithmetic number, because the mean of its divisors is an integer number (982031784300).

Almost surely, 2^{11211021221020} is an apocalyptic number.

11211021221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211021221020 is an abundant number, since it is smaller than the sum of its proper divisors (12357741602180).

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

11211021221020 is a wasteful number, since it uses less digits than its factorization.

11211021221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609958557 (or 609958555 counting only the distinct ones).

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

Adding to 11211021221020 its reverse (2012212011211), we get a palindrome (13223233232231).

The spelling of 11211021221020 in words is "eleven trillion, two hundred eleven billion, twenty-one million, two hundred twenty-one thousand, twenty".