4002406044021 has 144 divisors (see below), whose sum is σ = 7343138799360. Its totient is φ = 2056114368000.

The previous prime is 4002406043971. The next prime is 4002406044071. The reversal of 4002406044021 is 1204406042004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4002406043971) and next prime (4002406044071).

It is not a de Polignac number, because 4002406044021 - 2¹⁷ = 4002405912949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4002406044071) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 635198571 + ... + 635204871.

It is an arithmetic number, because the mean of its divisors is an integer number (50994019440).

Almost surely, 2^{4002406044021} is an apocalyptic number.

It is an amenable number.

4002406044021 is a deficient number, since it is larger than the sum of its proper divisors (3340732755339).

4002406044021 is a wasteful number, since it uses less digits than its factorization.

4002406044021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248 (or 7234 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The spelling of 4002406044021 in words is "four trillion, two billion, four hundred six million, forty-four thousand, twenty-one".