16443206421 has 32 divisors (see below), whose sum is σ = 22489989120. Its totient is φ = 10683057600.

The previous prime is 16443206399. The next prime is 16443206467. The reversal of 16443206421 is 12460234461.

It is a happy number.

It is not a de Polignac number, because 16443206421 - 2⁶ = 16443206357 is a prime.

It is a super-3 number, since 3×16443206421³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16443206821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12855660 + ... + 12856938.

It is an arithmetic number, because the mean of its divisors is an integer number (702812160).

Almost surely, 2^16443206421 is an apocalyptic number.

It is an amenable number.

16443206421 is a deficient number, since it is larger than the sum of its proper divisors (6046782699).

16443206421 is a wasteful number, since it uses less digits than its factorization.

16443206421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937.

The product of its (nonzero) digits is 27648, while the sum is 33.

The spelling of 16443206421 in words is "sixteen billion, four hundred forty-three million, two hundred six thousand, four hundred twenty-one".