2101945 has 8 divisors (see below), whose sum is σ = 2531520. Its totient is φ = 1675440.

The previous prime is 2101909. The next prime is 2101961. The reversal of 2101945 is 5491012.

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

It is not a de Polignac number, because 2101945 - 2⁷ = 2101817 is a prime.

2101945 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1210 + ... + 2380.

It is an arithmetic number, because the mean of its divisors is an integer number (316440).

2^2101945 is an apocalyptic number.

It is an amenable number.

2101945 is a deficient number, since it is larger than the sum of its proper divisors (429575).

2101945 is a wasteful number, since it uses less digits than its factorization.

2101945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 2101945 is about 1449.8086080583. The cubic root of 2101945 is about 128.0974396402.

Adding to 2101945 its reverse (5491012), we get a palindrome (7592957).

The spelling of 2101945 in words is "two million, one hundred one thousand, nine hundred forty-five".