2121534 has 24 divisors (see below), whose sum is σ = 4705272. Its totient is φ = 690480.

The previous prime is 2121529. The next prime is 2121569. The reversal of 2121534 is 4351212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 597 + ... + 2144.

It is an arithmetic number, because the mean of its divisors is an integer number (196053).

2^2121534 is an apocalyptic number.

2121534 is an abundant number, since it is smaller than the sum of its proper divisors (2583738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121534 is a wasteful number, since it uses less digits than its factorization.

2121534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792 (or 2789 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 2121534 is about 1456.5486603612. The cubic root of 2121534 is about 128.4941429701.

Adding to 2121534 its reverse (4351212), we get a palindrome (6472746).

The spelling of 2121534 in words is "two million, one hundred twenty-one thousand, five hundred thirty-four".