3921521441 has 2 divisors, whose sum is σ = 3921521442. Its totient is φ = 3921521440.

The previous prime is 3921521437. The next prime is 3921521497. The reversal of 3921521441 is 1441251293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3027750625 + 893770816 = 55025^2 + 29896^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921521441 - 2² = 3921521437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3921521398 and 3921521407.

It is not a weakly prime, because it can be changed into another prime (3921521411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960760720 + 1960760721.

It is an arithmetic number, because the mean of its divisors is an integer number (1960760721).

Almost surely, 2^3921521441 is an apocalyptic number.

It is an amenable number.

3921521441 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921521441 is an equidigital number, since it uses as much as digits as its factorization.

3921521441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 3921521441 is about 62622.0523537835. The cubic root of 3921521441 is about 1576.9509966763.

The spelling of 3921521441 in words is "three billion, nine hundred twenty-one million, five hundred twenty-one thousand, four hundred forty-one".