1012021320 has 64 divisors (see below), whose sum is σ = 3195864000. Its totient is φ = 255667968.

The previous prime is 1012021289. The next prime is 1012021337. The reversal of 1012021320 is 231202101.

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 = 1012021296 and 1012021305.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219655 + ... + 224214.

It is an arithmetic number, because the mean of its divisors is an integer number (49935375).

Almost surely, 2^1012021320 is an apocalyptic number.

1012021320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012021320 is an abundant number, since it is smaller than the sum of its proper divisors (2183842680).

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

1012021320 is a wasteful number, since it uses less digits than its factorization.

1012021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443902 (or 443898 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1012021320 is about 31812.2825336379. The cubic root of 1012021320 is about 1003.9911561471.

Adding to 1012021320 its reverse (231202101), we get a palindrome (1243223421).

The spelling of 1012021320 in words is "one billion, twelve million, twenty-one thousand, three hundred twenty".