2121516652218 has 8 divisors (see below), whose sum is σ = 4243033304448. Its totient is φ = 707172217404.

The previous prime is 2121516652207. The next prime is 2121516652237. The reversal of 2121516652218 is 8122566151212.

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

2121516652218 is an admirable number.

It is a super-3 number, since 3×2121516652218³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121516652218.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176793054346 + ... + 176793054357.

It is an arithmetic number, because the mean of its divisors is an integer number (530379163056).

Almost surely, 2^{2121516652218} is an apocalyptic number.

2121516652218 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.

2121516652218 is a wasteful number, since it uses less digits than its factorization.

2121516652218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353586108708.

The product of its digits is 115200, while the sum is 42.

The spelling of 2121516652218 in words is "two trillion, one hundred twenty-one billion, five hundred sixteen million, six hundred fifty-two thousand, two hundred eighteen".