1021000120 has 64 divisors (see below), whose sum is σ = 2628403200. Its totient is φ = 349660800.

The previous prime is 1021000103. The next prime is 1021000121. The reversal of 1021000120 is 210001201.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021000121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356695 + ... + 359545.

It is an arithmetic number, because the mean of its divisors is an integer number (41068800).

Almost surely, 2^1021000120 is an apocalyptic number.

1021000120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021000120 is an abundant number, since it is smaller than the sum of its proper divisors (1607403080).

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

1021000120 is a wasteful number, since it uses less digits than its factorization.

1021000120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4148 (or 4144 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1021000120 is about 31953.0924950935. The cubic root of 1021000120 is about 1006.9516032342.

Adding to 1021000120 its reverse (210001201), we get a palindrome (1231001321).

The spelling of 1021000120 in words is "one billion, twenty-one million, one hundred twenty", and thus it is an aban number.