16433256316221 has 8 divisors (see below), whose sum is σ = 24345564912960. Its totient is φ = 10955504210796.

The previous prime is 16433256316171. The next prime is 16433256316231. The reversal of 16433256316221 is 12261365233461.

16433256316221 is a `hidden beast` number, since 1 + 6 + 4 + 3 + 3 + 2 + 5 + 631 + 6 + 2 + 2 + 1 = 666.

It is not a de Polignac number, because 16433256316221 - 2¹⁰ = 16433256315197 is a prime.

It is a super-2 number, since 2×16433256316221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16433256316231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304319561385 + ... + 304319561438.

It is an arithmetic number, because the mean of its divisors is an integer number (3043195614120).

Almost surely, 2^{16433256316221} is an apocalyptic number.

It is an amenable number.

16433256316221 is a deficient number, since it is larger than the sum of its proper divisors (7912308596739).

16433256316221 is an equidigital number, since it uses as much as digits as its factorization.

16433256316221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608639122832 (or 608639122826 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The spelling of 16433256316221 in words is "sixteen trillion, four hundred thirty-three billion, two hundred fifty-six million, three hundred sixteen thousand, two hundred twenty-one".