3921521407 has 2 divisors, whose sum is σ = 3921521408. Its totient is φ = 3921521406.

The previous prime is 3921521363. The next prime is 3921521411. The reversal of 3921521407 is 7041251293.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3921521407 - 2¹¹ = 3921519359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3921521437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960760703 + 1960760704.

It is an arithmetic number, because the mean of its divisors is an integer number (1960760704).

Almost surely, 2^3921521407 is an apocalyptic number.

3921521407 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921521407 is an equidigital number, since it uses as much as digits as its factorization.

3921521407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 3921521407 is about 62622.0520823136. The cubic root of 3921521407 is about 1576.9509921188.

The spelling of 3921521407 in words is "three billion, nine hundred twenty-one million, five hundred twenty-one thousand, four hundred seven".