2105971 has 6 divisors (see below), whose sum is σ = 2449860. Its totient is φ = 1805076.

The previous prime is 2105969. The next prime is 2105993. The reversal of 2105971 is 1795012.

It is not a de Polignac number, because 2105971 - 2¹ = 2105969 is a prime.

It is a super-2 number, since 2×2105971² = 8870227705682, which contains 22 as substring.

2105971 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2105911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21441 + ... + 21538.

It is an arithmetic number, because the mean of its divisors is an integer number (408310).

2^2105971 is an apocalyptic number.

2105971 is a deficient number, since it is larger than the sum of its proper divisors (343889).

2105971 is an equidigital number, since it uses as much as digits as its factorization.

2105971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42993 (or 42986 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 2105971 is about 1451.1964029724. The cubic root of 2105971 is about 128.1791720954.

The spelling of 2105971 in words is "two million, one hundred five thousand, nine hundred seventy-one".