6821020372 has 6 divisors (see below), whose sum is σ = 11936785658. Its totient is φ = 3410510184.

The previous prime is 6821020319. The next prime is 6821020373. The reversal of 6821020372 is 2730201286.

It can be written as a sum of positive squares in only one way, i.e., 6335523216 + 485497156 = 79596^2 + 22034^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6821020373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 852627543 + ... + 852627550.

Almost surely, 2^6821020372 is an apocalyptic number.

It is an amenable number.

6821020372 is a deficient number, since it is larger than the sum of its proper divisors (5115765286).

6821020372 is a wasteful number, since it uses less digits than its factorization.

6821020372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705255097 (or 1705255095 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 6821020372 is about 82589.4688928316. The cubic root of 6821020372 is about 1896.4866163750.

The spelling of 6821020372 in words is "six billion, eight hundred twenty-one million, twenty thousand, three hundred seventy-two".