21220121002218 has 8 divisors (see below), whose sum is σ = 42440242004448. Its totient is φ = 7073373667404.

The previous prime is 21220121002217. The next prime is 21220121002307. The reversal of 21220121002218 is 81220012102212.

It is a sphenic number, since it is the product of 3 distinct primes.

21220121002218 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21220121002217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768343416846 + ... + 1768343416857.

It is an arithmetic number, because the mean of its divisors is an integer number (5305030250556).

Almost surely, 2^{21220121002218} is an apocalyptic number.

21220121002218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21220121002218 is a wasteful number, since it uses less digits than its factorization.

21220121002218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536686833708.

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 21220121002218 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two thousand, two hundred eighteen".