16521100043 has 12 divisors (see below), whose sum is σ = 19416556152. Its totient is φ = 14014949760.

The previous prime is 16521100033. The next prime is 16521100111. The reversal of 16521100043 is 34000112561.

It is not a de Polignac number, because 16521100043 - 2²² = 16516905739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16521099991 and 16521100018.

It is not an unprimeable number, because it can be changed into a prime (16521100033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1733213 + ... + 1742718.

It is an arithmetic number, because the mean of its divisors is an integer number (1618046346).

Almost surely, 2^16521100043 is an apocalyptic number.

16521100043 is a deficient number, since it is larger than the sum of its proper divisors (2895456109).

16521100043 is an equidigital number, since it uses as much as digits as its factorization.

16521100043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476042 (or 3476035 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The spelling of 16521100043 in words is "sixteen billion, five hundred twenty-one million, one hundred thousand, forty-three".