2572187821 has 12 divisors (see below), whose sum is σ = 3036799488. Its totient is φ = 2171823192.

The previous prime is 2572187809. The next prime is 2572187837. The reversal of 2572187821 is 1287812752.

It is not a de Polignac number, because 2572187821 - 2¹¹ = 2572185773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2572187801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 388461 + ... + 395026.

It is an arithmetic number, because the mean of its divisors is an integer number (253066624).

Almost surely, 2^2572187821 is an apocalyptic number.

It is an amenable number.

2572187821 is a deficient number, since it is larger than the sum of its proper divisors (464611667).

2572187821 is an equidigital number, since it uses as much as digits as its factorization.

2572187821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783568 (or 783561 counting only the distinct ones).

The product of its digits is 125440, while the sum is 43.

The square root of 2572187821 is about 50716.7410329173. The cubic root of 2572187821 is about 1370.1482463408.

The spelling of 2572187821 in words is "two billion, five hundred seventy-two million, one hundred eighty-seven thousand, eight hundred twenty-one".