21204051035 has 16 divisors (see below), whose sum is σ = 25648112160. Its totient is φ = 16827832320.

The previous prime is 21204050969. The next prime is 21204051047. The reversal of 21204051035 is 53015040212.

It is not a de Polignac number, because 21204051035 - 2¹⁰ = 21204050011 is a prime.

It is a super-2 number, since 2×21204051035² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21204051035.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3644789 + ... + 3650601.

It is an arithmetic number, because the mean of its divisors is an integer number (1603007010).

Almost surely, 2^21204051035 is an apocalyptic number.

21204051035 is a deficient number, since it is larger than the sum of its proper divisors (4444061125).

21204051035 is a wasteful number, since it uses less digits than its factorization.

21204051035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11518.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21204051035 its reverse (53015040212), we get a palindrome (74219091247).

The spelling of 21204051035 in words is "twenty-one billion, two hundred four million, fifty-one thousand, thirty-five".