4124639821 has 2 divisors, whose sum is σ = 4124639822. Its totient is φ = 4124639820.

The previous prime is 4124639809. The next prime is 4124639879. The reversal of 4124639821 is 1289364214.

4124639821 is digitally balanced in base 2, 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., 4000562500 + 124077321 = 63250^2 + 11139^2 .

It is a cyclic number.

It is not a de Polignac number, because 4124639821 - 2⁵ = 4124639789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4124639801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2062319910 + 2062319911.

It is an arithmetic number, because the mean of its divisors is an integer number (2062319911).

Almost surely, 2^4124639821 is an apocalyptic number.

It is an amenable number.

4124639821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4124639821 is an equidigital number, since it uses as much as digits as its factorization.

4124639821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 4124639821 is about 64223.3588424025. The cubic root of 4124639821 is about 1603.7204853965.

The spelling of 4124639821 in words is "four billion, one hundred twenty-four million, six hundred thirty-nine thousand, eight hundred twenty-one".