3867141721 has 2 divisors, whose sum is σ = 3867141722. Its totient is φ = 3867141720.

The previous prime is 3867141703. The next prime is 3867141749. The reversal of 3867141721 is 1271417683.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2501100121 + 1366041600 = 50011^2 + 36960^2 .

It is a cyclic number.

It is not a de Polignac number, because 3867141721 - 2¹⁵ = 3867108953 is a prime.

It is not a weakly prime, because it can be changed into another prime (3867141701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933570860 + 1933570861.

It is an arithmetic number, because the mean of its divisors is an integer number (1933570861).

Almost surely, 2^3867141721 is an apocalyptic number.

It is an amenable number.

3867141721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867141721 is an equidigital number, since it uses as much as digits as its factorization.

3867141721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 3867141721 is about 62186.3467410653. The cubic root of 3867141721 is about 1569.6278508581.

The spelling of 3867141721 in words is "three billion, eight hundred sixty-seven million, one hundred forty-one thousand, seven hundred twenty-one".