1011203231220 has 576 divisors, whose sum is σ = 3889480498176. Its totient is φ = 206928691200.

The previous prime is 1011203231219. The next prime is 1011203231239. The reversal of 1011203231220 is 221323021101.

1011203231220 is a `hidden beast` number, since 1 + 0 + 1 + 120 + 323 + 1 + 220 = 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 = 1011203231193 and 1011203231202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 204239745 + ... + 204244695.

Almost surely, 2^{1011203231220} is an apocalyptic number.

1011203231220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011203231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944740249088).

1011203231220 is an abundant number, since it is smaller than the sum of its proper divisors (2878277266956).

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

1011203231220 is a wasteful number, since it uses less digits than its factorization.

1011203231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360 (or 5355 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1011203231220 its reverse (221323021101), we get a palindrome (1232526252321).

The spelling of 1011203231220 in words is "one trillion, eleven billion, two hundred three million, two hundred thirty-one thousand, two hundred twenty".