4387126621 has 2 divisors, whose sum is σ = 4387126622. Its totient is φ = 4387126620.

The previous prime is 4387126613. The next prime is 4387126631. The reversal of 4387126621 is 1266217834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4028440900 + 358685721 = 63470^2 + 18939^2 .

It is a cyclic number.

It is not a de Polignac number, because 4387126621 - 2³ = 4387126613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4387126631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2193563310 + 2193563311.

It is an arithmetic number, because the mean of its divisors is an integer number (2193563311).

Almost surely, 2^4387126621 is an apocalyptic number.

It is an amenable number.

4387126621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4387126621 is an equidigital number, since it uses as much as digits as its factorization.

4387126621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 4387126621 is about 66235.3879810483. The cubic root of 4387126621 is about 1637.0428841651.

The spelling of 4387126621 in words is "four billion, three hundred eighty-seven million, one hundred twenty-six thousand, six hundred twenty-one".