2151121 has 16 divisors (see below), whose sum is σ = 2654208. Its totient is φ = 1702800.

The previous prime is 2151119. The next prime is 2151137. The reversal of 2151121 is 1211512.

It is a cyclic number.

It is not a de Polignac number, because 2151121 - 2¹ = 2151119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4776 + ... + 5206.

It is an arithmetic number, because the mean of its divisors is an integer number (165888).

2^2151121 is an apocalyptic number.

It is an amenable number.

2151121 is a deficient number, since it is larger than the sum of its proper divisors (503087).

2151121 is a wasteful number, since it uses less digits than its factorization.

2151121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492.

The product of its digits is 20, while the sum is 13.

The square root of 2151121 is about 1466.6700378749. The cubic root of 2151121 is about 129.0887156907.

Adding to 2151121 its reverse (1211512), we get a palindrome (3362633).

The spelling of 2151121 in words is "two million, one hundred fifty-one thousand, one hundred twenty-one".