2121863115216 has 160 divisors (see below), whose sum is σ = 6346033827840. Its totient is φ = 605358669312.

The previous prime is 2121863115149. The next prime is 2121863115223. The reversal of 2121863115216 is 6125113681212.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 1346700 + ... + 2461163.

It is an arithmetic number, because the mean of its divisors is an integer number (39662711424).

Almost surely, 2^{2121863115216} is an apocalyptic number.

2121863115216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

2121863115216 is an abundant number, since it is smaller than the sum of its proper divisors (4224170712624).

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

2121863115216 is a wasteful number, since it uses less digits than its factorization.

2121863115216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3807953 (or 3807947 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

Adding to 2121863115216 its reverse (6125113681212), we get a palindrome (8246976796428).

The spelling of 2121863115216 in words is "two trillion, one hundred twenty-one billion, eight hundred sixty-three million, one hundred fifteen thousand, two hundred sixteen".