21043551235 has 32 divisors (see below), whose sum is σ = 30671187840. Its totient is φ = 13530458112.

The previous prime is 21043551233. The next prime is 21043551301. The reversal of 21043551235 is 53215534012.

It is a cyclic number.

It is not a de Polignac number, because 21043551235 - 2¹ = 21043551233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21043551197 and 21043551206.

It is not an unprimeable number, because it can be changed into a prime (21043551233) 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, 94317 + ... + 225793.

It is an arithmetic number, because the mean of its divisors is an integer number (958474620).

Almost surely, 2^21043551235 is an apocalyptic number.

21043551235 is a deficient number, since it is larger than the sum of its proper divisors (9627636605).

21043551235 is a wasteful number, since it uses less digits than its factorization.

21043551235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131775.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21043551235 in words is "twenty-one billion, forty-three million, five hundred fifty-one thousand, two hundred thirty-five".