2111554511220 has 192 divisors, whose sum is σ = 7372677666816. Its totient is φ = 438679288320.

The previous prime is 2111554511219. The next prime is 2111554511251. The reversal of 2111554511220 is 221154551112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25289782 + ... + 25373138.

It is an arithmetic number, because the mean of its divisors is an integer number (38399362848).

Almost surely, 2^{2111554511220} is an apocalyptic number.

2111554511220 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 2111554511220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3686338833408).

2111554511220 is an abundant number, since it is smaller than the sum of its proper divisors (5261123155596).

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

2111554511220 is a wasteful number, since it uses less digits than its factorization.

2111554511220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88870 (or 88868 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 30.

The spelling of 2111554511220 in words is "two trillion, one hundred eleven billion, five hundred fifty-four million, five hundred eleven thousand, two hundred twenty".