3924612821 has 2 divisors, whose sum is σ = 3924612822. Its totient is φ = 3924612820.

The previous prime is 3924612817. The next prime is 3924612859. The reversal of 3924612821 is 1282164293.

It is an a-pointer prime, because the next prime (3924612859) can be obtained adding 3924612821 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3112077796 + 812535025 = 55786^2 + 28505^2 .

It is a cyclic number.

It is not a de Polignac number, because 3924612821 - 2² = 3924612817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3924612221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1962306410 + 1962306411.

It is an arithmetic number, because the mean of its divisors is an integer number (1962306411).

Almost surely, 2^3924612821 is an apocalyptic number.

It is an amenable number.

3924612821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3924612821 is an equidigital number, since it uses as much as digits as its factorization.

3924612821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 3924612821 is about 62646.7303296828. The cubic root of 3924612821 is about 1577.3652639798.

The spelling of 3924612821 in words is "three billion, nine hundred twenty-four million, six hundred twelve thousand, eight hundred twenty-one".