21404066446007 has 16 divisors (see below), whose sum is σ = 25525519967232. Its totient is φ = 17548556213760.

The previous prime is 21404066445967. The next prime is 21404066446019. The reversal of 21404066446007 is 70064466040412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21404066446007 - 2¹² = 21404066441911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404066446027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29381207 + ... + 30100887.

It is an arithmetic number, because the mean of its divisors is an integer number (1595344997952).

Almost surely, 2^{21404066446007} is an apocalyptic number.

21404066446007 is a deficient number, since it is larger than the sum of its proper divisors (4121453521225).

21404066446007 is a wasteful number, since it uses less digits than its factorization.

21404066446007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904438.

The product of its (nonzero) digits is 774144, while the sum is 44.

The spelling of 21404066446007 in words is "twenty-one trillion, four hundred four billion, sixty-six million, four hundred forty-six thousand, seven".