2101554 has 48 divisors (see below), whose sum is σ = 5608512. Its totient is φ = 553824.

The previous prime is 2101553. The next prime is 2101607. The reversal of 2101554 is 4551012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2101553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 997 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (116844).

2^2101554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2804256).

2101554 is an abundant number, since it is smaller than the sum of its proper divisors (3506958).

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

2101554 is a wasteful number, since it uses less digits than its factorization.

2101554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2101554 is about 1449.6737564018. The cubic root of 2101554 is about 128.0894963297.

Adding to 2101554 its reverse (4551012), we get a palindrome (6652566).

It can be divided in two parts, 210 and 1554, that added together give a square (1764 = 42²).

The spelling of 2101554 in words is "two million, one hundred one thousand, five hundred fifty-four".