3864475271621 has 2 divisors, whose sum is σ = 3864475271622. Its totient is φ = 3864475271620.

The previous prime is 3864475271611. The next prime is 3864475271647. The reversal of 3864475271621 is 1261725744683.

It is a happy number.

3864475271621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3794509202500 + 69966069121 = 1947950^2 + 264511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3864475271621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3864475271611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1932237635810 + 1932237635811.

It is an arithmetic number, because the mean of its divisors is an integer number (1932237635811).

Almost surely, 2^{3864475271621} is an apocalyptic number.

It is an amenable number.

3864475271621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3864475271621 is an equidigital number, since it uses as much as digits as its factorization.

3864475271621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 56.

The spelling of 3864475271621 in words is "three trillion, eight hundred sixty-four billion, four hundred seventy-five million, two hundred seventy-one thousand, six hundred twenty-one".