6861421 has 12 divisors (see below), whose sum is σ = 8452188. Its totient is φ = 5534592.

The previous prime is 6861419. The next prime is 6861427. The reversal of 6861421 is 1241686.

6861421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4862025 + 1999396 = 2205^2 + 1414^2 .

It is not a de Polignac number, because 6861421 - 2¹ = 6861419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6861421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861427) 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, 3286 + ... + 4951.

It is an arithmetic number, because the mean of its divisors is an integer number (704349).

Almost surely, 2^6861421 is an apocalyptic number.

It is an amenable number.

6861421 is a deficient number, since it is larger than the sum of its proper divisors (1590767).

6861421 is a wasteful number, since it uses less digits than its factorization.

6861421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8268 (or 8261 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 6861421 is about 2619.4314268558. The cubic root of 6861421 is about 190.0223519410.

It can be divided in two parts, 68614 and 21, that added together give a triangular number (68635 = T₃₇₀).

The spelling of 6861421 in words is "six million, eight hundred sixty-one thousand, four hundred twenty-one".