2101020660 has 96 divisors (see below), whose sum is σ = 6747417600. Its totient is φ = 542194560.

The previous prime is 2101020643. The next prime is 2101020661. The reversal of 2101020660 is 660201012.

It is a happy number.

2101020660 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 0 + 2 + 0 + 660 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101020661) 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 31 ways as a sum of consecutive naturals, for example, 46015 + ... + 79494.

It is an arithmetic number, because the mean of its divisors is an integer number (70285600).

Almost surely, 2^2101020660 is an apocalyptic number.

2101020660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101020660 is an abundant number, since it is smaller than the sum of its proper divisors (4646396940).

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

2101020660 is a wasteful number, since it uses less digits than its factorization.

2101020660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125558 (or 125550 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2101020660 is about 45836.8919103379. The cubic root of 2101020660 is about 1280.7865974058.

Adding to 2101020660 its reverse (660201012), we get a palindrome (2761221672).

The spelling of 2101020660 in words is "two billion, one hundred one million, twenty thousand, six hundred sixty".