4051387615021 has 2 divisors, whose sum is σ = 4051387615022. Its totient is φ = 4051387615020.

The previous prime is 4051387614943. The next prime is 4051387615043. The reversal of 4051387615021 is 1205167831504.

4051387615021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4013912075625 + 37475539396 = 2003475^2 + 193586^2 .

It is a cyclic number.

It is not a de Polignac number, because 4051387615021 - 2⁹ = 4051387614509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4051387645021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2025693807510 + 2025693807511.

It is an arithmetic number, because the mean of its divisors is an integer number (2025693807511).

Almost surely, 2^{4051387615021} is an apocalyptic number.

It is an amenable number.

4051387615021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4051387615021 is an equidigital number, since it uses as much as digits as its factorization.

4051387615021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 4051387615021 in words is "four trillion, fifty-one billion, three hundred eighty-seven million, six hundred fifteen thousand, twenty-one".