2121355434 has 64 divisors (see below), whose sum is σ = 4975810560. Its totient is φ = 596027520.

The previous prime is 2121355433. The next prime is 2121355477. The reversal of 2121355434 is 4345531212.

It is a super-2 number, since 2×2121355434² = 9000297754722656712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121355433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40942 + ... + 76934.

It is an arithmetic number, because the mean of its divisors is an integer number (77747040).

Almost surely, 2^2121355434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121355434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2487905280).

2121355434 is an abundant number, since it is smaller than the sum of its proper divisors (2854455126).

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

2121355434 is a wasteful number, since it uses less digits than its factorization.

2121355434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36075.

The product of its digits is 14400, while the sum is 30.

The square root of 2121355434 is about 46058.1744536190. The cubic root of 2121355434 is about 1284.9053782265.

Adding to 2121355434 its reverse (4345531212), we get a palindrome (6466886646).

The spelling of 2121355434 in words is "two billion, one hundred twenty-one million, three hundred fifty-five thousand, four hundred thirty-four".