2101445 has 8 divisors (see below), whose sum is σ = 2538744. Its totient is φ = 1669824.

The previous prime is 2101439. The next prime is 2101447. The reversal of 2101445 is 5441012.

It can be written as a sum of positive squares in 4 ways, for example, as 24964 + 2076481 = 158^2 + 1441^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101445 - 2⁸ = 2101189 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554 + ... + 2123.

It is an arithmetic number, because the mean of its divisors is an integer number (317343).

2^2101445 is an apocalyptic number.

It is an amenable number.

2101445 is a deficient number, since it is larger than the sum of its proper divisors (437299).

2101445 is a wasteful number, since it uses less digits than its factorization.

2101445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 2101445 is about 1449.6361612487. The cubic root of 2101445 is about 128.0872817786.

Adding to 2101445 its reverse (5441012), we get a palindrome (7542457).

The spelling of 2101445 in words is "two million, one hundred one thousand, four hundred forty-five".