2101560 has 64 divisors (see below), whose sum is σ = 6410880. Its totient is φ = 551040.

The previous prime is 2101553. The next prime is 2101607. The reversal of 2101560 is 651012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9855 + ... + 10065.

It is an arithmetic number, because the mean of its divisors is an integer number (100170).

2^2101560 is an apocalyptic number.

2101560 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 2101560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3205440).

2101560 is an abundant number, since it is smaller than the sum of its proper divisors (4309320).

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

2101560 is a wasteful number, since it uses less digits than its factorization.

2101560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 2101560 is about 1449.6758258314. The cubic root of 2101560 is about 128.0896182294.

Adding to 2101560 its reverse (651012), we get a palindrome (2752572).

It can be divided in two parts, 210 and 1560, that added together give a triangular number (1770 = T₅₉).

The spelling of 2101560 in words is "two million, one hundred one thousand, five hundred sixty".