1121021021220 has 48 divisors (see below), whose sum is σ = 3304061960640. Its totient is φ = 283205310336.

The previous prime is 1121021021213. The next prime is 1121021021227. The reversal of 1121021021220 is 221201201211.

It is an interprime number because it is at equal distance from previous prime (1121021021213) and next prime (1121021021227).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1121021021220.

It is not an unprimeable number, because it can be changed into a prime (1121021021227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 491674747 + ... + 491677026.

It is an arithmetic number, because the mean of its divisors is an integer number (68834624180).

Almost surely, 2^{1121021021220} is an apocalyptic number.

1121021021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121021021220 is an abundant number, since it is smaller than the sum of its proper divisors (2183040939420).

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

1121021021220 is a wasteful number, since it uses less digits than its factorization.

1121021021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983351804 (or 983351802 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1121021021220 its reverse (221201201211), we get a palindrome (1342222222431).

It can be divided in two parts, 11210210 and 21220, that added together give a triangular number (11231430 = T₄₇₃₉).

The spelling of 1121021021220 in words is "one trillion, one hundred twenty-one billion, twenty-one million, twenty-one thousand, two hundred twenty".