1021212120 has 128 divisors (see below), whose sum is σ = 3149798400. Its totient is φ = 264769536.

The previous prime is 1021212113. The next prime is 1021212131. The reversal of 1021212120 is 212121201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1021212096 and 1021212105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 686017 + ... + 687503.

It is an arithmetic number, because the mean of its divisors is an integer number (24607800).

Almost surely, 2^1021212120 is an apocalyptic number.

1021212120 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 1021212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1574899200).

1021212120 is an abundant number, since it is smaller than the sum of its proper divisors (2128586280).

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

1021212120 is a wasteful number, since it uses less digits than its factorization.

1021212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657 (or 1653 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1021212120 is about 31956.4096856953. The cubic root of 1021212120 is about 1007.0212927351.

Adding to 1021212120 its reverse (212121201), we get a palindrome (1233333321).

The spelling of 1021212120 in words is "one billion, twenty-one million, two hundred twelve thousand, one hundred twenty".