2620081021 has 8 divisors (see below), whose sum is σ = 2790242424. Its totient is φ = 2451701760.

The previous prime is 2620081001. The next prime is 2620081043. The reversal of 2620081021 is 1201800262.

It can be written as a sum of positive squares in 4 ways, for example, as 523723225 + 2096357796 = 22885^2 + 45786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2620081021 - 2²⁵ = 2586526589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2620080983 and 2620081001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620081001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442500 + ... + 448381.

It is an arithmetic number, because the mean of its divisors is an integer number (348780303).

Almost surely, 2^2620081021 is an apocalyptic number.

It is an amenable number.

2620081021 is a deficient number, since it is larger than the sum of its proper divisors (170161403).

2620081021 is a wasteful number, since it uses less digits than its factorization.

2620081021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891071.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2620081021 is about 51186.7270002683. The cubic root of 2620081021 is about 1378.5998928977.

Adding to 2620081021 its reverse (1201800262), we get a palindrome (3821881283).

The spelling of 2620081021 in words is "two billion, six hundred twenty million, eighty-one thousand, twenty-one".