21061035 has 24 divisors (see below), whose sum is σ = 36625680. Its totient is φ = 11195712.

The previous prime is 21061021. The next prime is 21061037. The reversal of 21061035 is 53016012.

21061035 is a `hidden beast` number, since 21 + 0 + 610 + 35 = 666.

It is not a de Polignac number, because 21061035 - 2¹¹ = 21058987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21060999 and 21061017.

It is not an unprimeable number, because it can be changed into a prime (21061037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18297 + ... + 19413.

It is an arithmetic number, because the mean of its divisors is an integer number (1526070).

Almost surely, 2^21061035 is an apocalyptic number.

21061035 is a deficient number, since it is larger than the sum of its proper divisors (15564645).

21061035 is a wasteful number, since it uses less digits than its factorization.

21061035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547 (or 1544 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 21061035 is about 4589.2303276258. The cubic root of 21061035 is about 276.1594463068.

Adding to 21061035 its reverse (53016012), we get a palindrome (74077047).

The spelling of 21061035 in words is "twenty-one million, sixty-one thousand, thirty-five".