21145833835 has 16 divisors (see below), whose sum is σ = 29009304000. Its totient is φ = 14495348736.

The previous prime is 21145833833. The next prime is 21145833869. The reversal of 21145833835 is 53833854112.

It is a cyclic number.

It is not a de Polignac number, because 21145833835 - 2¹ = 21145833833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21145833791 and 21145833800.

It is not an unprimeable number, because it can be changed into a prime (21145833833) 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, 15591 + ... + 206239.

It is an arithmetic number, because the mean of its divisors is an integer number (1813081500).

Almost surely, 2^21145833835 is an apocalyptic number.

21145833835 is a deficient number, since it is larger than the sum of its proper divisors (7863470165).

21145833835 is a wasteful number, since it uses less digits than its factorization.

21145833835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193830.

The product of its digits is 345600, while the sum is 43.

The spelling of 21145833835 in words is "twenty-one billion, one hundred forty-five million, eight hundred thirty-three thousand, eight hundred thirty-five".