1021640120 has 32 divisors (see below), whose sum is σ = 2333005200. Its totient is φ = 402555648.

The previous prime is 1021640117. The next prime is 1021640129. The reversal of 1021640120 is 210461201.

It is a super-2 number, since 2×1021640120² = 2087497069587228800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021640129) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 187925 + ... + 193284.

Almost surely, 2^1021640120 is an apocalyptic number.

1021640120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021640120 is an abundant number, since it is smaller than the sum of its proper divisors (1311365080).

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

1021640120 is a wasteful number, since it uses less digits than its factorization.

1021640120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381287 (or 381283 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1021640120 is about 31963.1056063080. The cubic root of 1021640120 is about 1007.1619572475.

The spelling of 1021640120 in words is "one billion, twenty-one million, six hundred forty thousand, one hundred twenty".