2011321020 has 48 divisors (see below), whose sum is σ = 5876559360. Its totient is φ = 513032256.

The previous prime is 2011321003. The next prime is 2011321027. The reversal of 2011321020 is 201231102.

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 = 2011320987 and 2011321005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011321027) 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, 727360 + ... + 730119.

It is an arithmetic number, because the mean of its divisors is an integer number (122428320).

Almost surely, 2^2011321020 is an apocalyptic number.

2011321020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011321020 is an abundant number, since it is smaller than the sum of its proper divisors (3865238340).

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

2011321020 is a wasteful number, since it uses less digits than its factorization.

2011321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457514 (or 1457512 counting only the distinct ones).

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

The square root of 2011321020 is about 44847.7537899057. The cubic root of 2011321020 is about 1262.2938436704.

Adding to 2011321020 its reverse (201231102), we get a palindrome (2212552122).

The spelling of 2011321020 in words is "two billion, eleven million, three hundred twenty-one thousand, twenty".