21802180202 has 32 divisors (see below), whose sum is σ = 36422706240. Its totient is φ = 9704058880.

The previous prime is 21802180201. The next prime is 21802180291. The reversal of 21802180202 is 20208120812.

It is not an unprimeable number, because it can be changed into a prime (21802180201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300908 + ... + 366264.

It is an arithmetic number, because the mean of its divisors is an integer number (1138209570).

Almost surely, 2^21802180202 is an apocalyptic number.

21802180202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21802180202 is a deficient number, since it is larger than the sum of its proper divisors (14620526038).

21802180202 is a wasteful number, since it uses less digits than its factorization.

21802180202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65686.

The product of its (nonzero) digits is 1024, while the sum is 26.

The spelling of 21802180202 in words is "twenty-one billion, eight hundred two million, one hundred eighty thousand, two hundred two".