11122121221020 has 72 divisors (see below), whose sum is σ = 33737374092240. Its totient is φ = 2965874987520.

The previous prime is 11122121221009. The next prime is 11122121221027. The reversal of 11122121221020 is 2012212122111.

11122121221020 is a `hidden beast` number, since 1 + 1 + 1 + 221 + 212 + 210 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 11122121220984 and 11122121221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122121221027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39988996 + ... + 40266164.

It is an arithmetic number, because the mean of its divisors is an integer number (468574640170).

Almost surely, 2^{11122121221020} is an apocalyptic number.

11122121221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11122121221020 is an abundant number, since it is smaller than the sum of its proper divisors (22615252871220).

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

11122121221020 is a wasteful number, since it uses less digits than its factorization.

11122121221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500115 (or 500110 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11122121221020 its reverse (2012212122111), we get a palindrome (13134333343131).

The spelling of 11122121221020 in words is "eleven trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty".