2120537556 has 72 divisors (see below), whose sum is σ = 5611001760. Its totient is φ = 700205472.

The previous prime is 2120537543. The next prime is 2120537597. The reversal of 2120537556 is 6557350212.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2120537556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93810 + ... + 114198.

It is an arithmetic number, because the mean of its divisors is an integer number (77930580).

Almost surely, 2^2120537556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2120537556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2805500880).

2120537556 is an abundant number, since it is smaller than the sum of its proper divisors (3490464204).

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

2120537556 is a wasteful number, since it uses less digits than its factorization.

2120537556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20515 (or 20501 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 2120537556 is about 46049.2948480213. The cubic root of 2120537556 is about 1284.7402273817.

Adding to 2120537556 its reverse (6557350212), we get a palindrome (8677887768).

The spelling of 2120537556 in words is "two billion, one hundred twenty million, five hundred thirty-seven thousand, five hundred fifty-six".