21055021035 has 16 divisors (see below), whose sum is σ = 33706679040. Its totient is φ = 11223129440.

The previous prime is 21055020949. The next prime is 21055021063. The reversal of 21055021035 is 53012055012.

It is a happy number.

It is not a de Polignac number, because 21055021035 - 2¹⁰ = 21055020011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21055020996 and 21055021014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360375 + ... + 414704.

It is an arithmetic number, because the mean of its divisors is an integer number (2106667440).

Almost surely, 2^21055021035 is an apocalyptic number.

21055021035 is a deficient number, since it is larger than the sum of its proper divisors (12651658005).

21055021035 is a wasteful number, since it uses less digits than its factorization.

21055021035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776898.

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 21055021035 its reverse (53012055012), we get a palindrome (74067076047).

The spelling of 21055021035 in words is "twenty-one billion, fifty-five million, twenty-one thousand, thirty-five".