2123001 has 6 divisors (see below), whose sum is σ = 3066570. Its totient is φ = 1415328.

The previous prime is 2122979. The next prime is 2123027. The reversal of 2123001 is 1003212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1687401 + 435600 = 1299^2 + 660^2 .

It is not a de Polignac number, because 2123001 - 2⁶ = 2122937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 235889 = 2123001 / (2 + 1 + 2 + 3 + 0 + 0 + 1).

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2123081) 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, 117936 + ... + 117953.

It is an arithmetic number, because the mean of its divisors is an integer number (511095).

2^2123001 is an apocalyptic number.

It is an amenable number.

2123001 is a deficient number, since it is larger than the sum of its proper divisors (943569).

2123001 is a wasteful number, since it uses less digits than its factorization.

2123001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235895 (or 235892 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2123001 is about 1457.0521610430. The cubic root of 2123001 is about 128.5237532232.

Adding to 2123001 its reverse (1003212), we get a palindrome (3126213).

The spelling of 2123001 in words is "two million, one hundred twenty-three thousand, one".