1000021120 has 64 divisors (see below), whose sum is σ = 2732212800. Its totient is φ = 342862848.

The previous prime is 1000021097. The next prime is 1000021133. The reversal of 1000021120 is 211200001.

It is a tau number, because it is divible by the number of its divisors (64).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107130 + ... + 116089.

It is an arithmetic number, because the mean of its divisors is an integer number (42690825).

Almost surely, 2^1000021120 is an apocalyptic number.

1000021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000021120 is an abundant number, since it is smaller than the sum of its proper divisors (1732191680).

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

1000021120 is an equidigital number, since it uses as much as digits as its factorization.

1000021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223245 (or 223233 counting only the distinct ones).

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

The square root of 1000021120 is about 31623.1105364415. The cubic root of 1000021120 is about 1000.0070399504.

Adding to 1000021120 its reverse (211200001), we get a palindrome (1211221121).

The spelling of 1000021120 in words is "one billion, twenty-one thousand, one hundred twenty".