2028510130621 has 4 divisors (see below), whose sum is σ = 2184549371452. Its totient is φ = 1872470889792.

The previous prime is 2028510130547. The next prime is 2028510130663. The reversal of 2028510130621 is 1260310158202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1227375936900 + 801134193721 = 1107870^2 + 895061^2 .

It is a cyclic number.

It is not a de Polignac number, because 2028510130621 - 2¹¹ = 2028510128573 is a prime.

It is a super-2 number, since 2×2028510130621² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2028510130681) 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 3 ways as a sum of consecutive naturals, for example, 78019620396 + ... + 78019620421.

It is an arithmetic number, because the mean of its divisors is an integer number (546137342863).

Almost surely, 2^{2028510130621} is an apocalyptic number.

It is an amenable number.

2028510130621 is a deficient number, since it is larger than the sum of its proper divisors (156039240831).

2028510130621 is a wasteful number, since it uses less digits than its factorization.

2028510130621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156039240830.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 2028510130621 its reverse (1260310158202), we get a palindrome (3288820288823).

The spelling of 2028510130621 in words is "two trillion, twenty-eight billion, five hundred ten million, one hundred thirty thousand, six hundred twenty-one".