2121254534 has 32 divisors (see below), whose sum is σ = 3802553856. Its totient is φ = 867746880.

The previous prime is 2121254519. The next prime is 2121254537. The reversal of 2121254534 is 4354521212.

It is a junction number, because it is equal to n+sod(n) for n = 2121254497 and 2121254506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121254537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151394 + ... + 164810.

It is an arithmetic number, because the mean of its divisors is an integer number (118829808).

Almost surely, 2^2121254534 is an apocalyptic number.

2121254534 is a deficient number, since it is larger than the sum of its proper divisors (1681299322).

2121254534 is a wasteful number, since it uses less digits than its factorization.

2121254534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13940.

The product of its digits is 9600, while the sum is 29.

The square root of 2121254534 is about 46057.0790867159. The cubic root of 2121254534 is about 1284.8850061873.

Adding to 2121254534 its reverse (4354521212), we get a palindrome (6475775746).

The spelling of 2121254534 in words is "two billion, one hundred twenty-one million, two hundred fifty-four thousand, five hundred thirty-four".