4251020041821 has 16 divisors (see below), whose sum is σ = 6478148009984. Its totient is φ = 2429003115504.

The previous prime is 4251020041813. The next prime is 4251020041897. The reversal of 4251020041821 is 1281400201524.

It is not a de Polignac number, because 4251020041821 - 2³ = 4251020041813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4251020041421) 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 in 15 ways as a sum of consecutive naturals, for example, 5953885 + ... + 6629538.

It is an arithmetic number, because the mean of its divisors is an integer number (404884250624).

Almost surely, 2^{4251020041821} is an apocalyptic number.

It is an amenable number.

4251020041821 is a deficient number, since it is larger than the sum of its proper divisors (2227127968163).

4251020041821 is a wasteful number, since it uses less digits than its factorization.

4251020041821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12599520.

The product of its (nonzero) digits is 5120, while the sum is 30.

The spelling of 4251020041821 in words is "four trillion, two hundred fifty-one billion, twenty million, forty-one thousand, eight hundred twenty-one".