21220001202218 has 32 divisors (see below), whose sum is σ = 39760094123904. Its totient is φ = 8269431331392.

The previous prime is 21220001202217. The next prime is 21220001202271. The reversal of 21220001202218 is 81220210002212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21220001202193 and 21220001202202.

It is not an unprimeable number, because it can be changed into a prime (21220001202217) 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, 870087905 + ... + 870112292.

It is an arithmetic number, because the mean of its divisors is an integer number (1242502941372).

Almost surely, 2^{21220001202218} is an apocalyptic number.

21220001202218 is a deficient number, since it is larger than the sum of its proper divisors (18540092921686).

21220001202218 is a wasteful number, since it uses less digits than its factorization.

21220001202218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740200286.

The product of its (nonzero) digits is 512, while the sum is 23.

The spelling of 21220001202218 in words is "twenty-one trillion, two hundred twenty billion, one million, two hundred two thousand, two hundred eighteen".