16521100001 has 16 divisors (see below), whose sum is σ = 19889049600. Its totient is φ = 13406151888.

The previous prime is 16521099989. The next prime is 16521100009. The reversal of 16521100001 is 10000112561.

It is a cyclic number.

It is not a de Polignac number, because 16521100001 - 2¹⁸ = 16520837857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16521100009) 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, 148226 + ... + 234548.

It is an arithmetic number, because the mean of its divisors is an integer number (1243065600).

Almost surely, 2^16521100001 is an apocalyptic number.

It is an amenable number.

16521100001 is a deficient number, since it is larger than the sum of its proper divisors (3367949599).

16521100001 is a wasteful number, since it uses less digits than its factorization.

16521100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87788.

The product of its (nonzero) digits is 60, while the sum is 17.

Adding to 16521100001 its reverse (10000112561), we get a palindrome (26521212562).

The spelling of 16521100001 in words is "sixteen billion, five hundred twenty-one million, one hundred thousand, one".