2111904678520 has 192 divisors, whose sum is σ = 6007406882400. Its totient is φ = 662250193920.

The previous prime is 2111904678493. The next prime is 2111904678551. The reversal of 2111904678520 is 258764091112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2397115 + ... + 3157525.

Almost surely, 2^{2111904678520} is an apocalyptic number.

2111904678520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2111904678520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3003703441200).

2111904678520 is an abundant number, since it is smaller than the sum of its proper divisors (3895502203880).

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

2111904678520 is a wasteful number, since it uses less digits than its factorization.

2111904678520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760558 (or 760547 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 2111904678520 in words is "two trillion, one hundred eleven billion, nine hundred four million, six hundred seventy-eight thousand, five hundred twenty".