16621556210 has 32 divisors (see below), whose sum is σ = 35026895232. Its totient is φ = 5559822720.

The previous prime is 16621556209. The next prime is 16621556221. The reversal of 16621556210 is 1265512661.

It is a super-2 number, since 2×16621556210² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2892872 + ... + 2898611.

It is an arithmetic number, because the mean of its divisors is an integer number (1094590476).

Almost surely, 2^16621556210 is an apocalyptic number.

16621556210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16621556210 is an abundant number, since it is smaller than the sum of its proper divisors (18405339022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16621556210 is a wasteful number, since it uses less digits than its factorization.

16621556210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5791538.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 16621556210 in words is "sixteen billion, six hundred twenty-one million, five hundred fifty-six thousand, two hundred ten".