1021120120 has 32 divisors (see below), whose sum is σ = 2346408000. Its totient is φ = 399756928.

The previous prime is 1021120103. The next prime is 1021120159. The reversal of 1021120120 is 210211201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1021120097 and 1021120106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269695 + ... + 273454.

It is an arithmetic number, because the mean of its divisors is an integer number (73325250).

Almost surely, 2^1021120120 is an apocalyptic number.

1021120120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021120120 is an abundant number, since it is smaller than the sum of its proper divisors (1325287880).

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

1021120120 is a wasteful number, since it uses less digits than its factorization.

1021120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543207 (or 543203 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1021120120 is about 31954.9701924442. The cubic root of 1021120120 is about 1006.9910513062.

Adding to 1021120120 its reverse (210211201), we get a palindrome (1231331321).

The spelling of 1021120120 in words is "one billion, twenty-one million, one hundred twenty thousand, one hundred twenty".