2121534436 has 24 divisors (see below), whose sum is σ = 4244240000. Its totient is φ = 908978112.

The previous prime is 2121534427. The next prime is 2121534479. The reversal of 2121534436 is 6344351212.

It is a junction number, because it is equal to n+sod(n) for n = 2121534398 and 2121534407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122440 + ... + 138688.

Almost surely, 2^2121534436 is an apocalyptic number.

It is an amenable number.

2121534436 is an abundant number, since it is smaller than the sum of its proper divisors (2122705564).

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

2121534436 is a wasteful number, since it uses less digits than its factorization.

2121534436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20923 (or 20921 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 2121534436 is about 46060.1176290291. The cubic root of 2121534436 is about 1284.9415177248.

Adding to 2121534436 its reverse (6344351212), we get a palindrome (8465885648).

The spelling of 2121534436 in words is "two billion, one hundred twenty-one million, five hundred thirty-four thousand, four hundred thirty-six".