2218121689620 has 96 divisors (see below), whose sum is σ = 6355850231808. Its totient is φ = 577682082432.

The previous prime is 2218121689541. The next prime is 2218121689673. The reversal of 2218121689620 is 269861218122.

It is a self number, because there is not a number n which added to its sum of digits gives 2218121689620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27532237 + ... + 27612683.

It is an arithmetic number, because the mean of its divisors is an integer number (66206773248).

Almost surely, 2^{2218121689620} is an apocalyptic number.

2218121689620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2218121689620 is an abundant number, since it is smaller than the sum of its proper divisors (4137728542188).

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

2218121689620 is a wasteful number, since it uses less digits than its factorization.

2218121689620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91189 (or 91187 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The spelling of 2218121689620 in words is "two trillion, two hundred eighteen billion, one hundred twenty-one million, six hundred eighty-nine thousand, six hundred twenty".