2686146821 has 2 divisors, whose sum is σ = 2686146822. Its totient is φ = 2686146820.

The previous prime is 2686146817. The next prime is 2686146823. The reversal of 2686146821 is 1286416862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2556414721 + 129732100 = 50561^2 + 11390^2 .

It is a cyclic number.

It is not a de Polignac number, because 2686146821 - 2² = 2686146817 is a prime.

Together with 2686146823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2686146823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343073410 + 1343073411.

It is an arithmetic number, because the mean of its divisors is an integer number (1343073411).

Almost surely, 2^2686146821 is an apocalyptic number.

It is an amenable number.

2686146821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2686146821 is an equidigital number, since it uses as much as digits as its factorization.

2686146821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 44.

The square root of 2686146821 is about 51828.0505228588. The cubic root of 2686146821 is about 1390.0910557468.

The spelling of 2686146821 in words is "two billion, six hundred eighty-six million, one hundred forty-six thousand, eight hundred twenty-one".