1021200120 has 192 divisors, whose sum is σ = 3481077600. Its totient is φ = 259338240.

The previous prime is 1021200119. The next prime is 1021200197. The reversal of 1021200120 is 210021201.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 633876 + ... + 635484.

Almost surely, 2^1021200120 is an apocalyptic number.

1021200120 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 1021200120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1740538800).

1021200120 is an abundant number, since it is smaller than the sum of its proper divisors (2459877480).

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

1021200120 is a wasteful number, since it uses less digits than its factorization.

1021200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710 (or 1703 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1021200120 is about 31956.2219293833. The cubic root of 1021200120 is about 1007.0173483039.

Adding to 1021200120 its reverse (210021201), we get a palindrome (1231221321).

The spelling of 1021200120 in words is "one billion, twenty-one million, two hundred thousand, one hundred twenty".