21011055435 has 12 divisors (see below), whose sum is σ = 36419162832. Its totient is φ = 11205896208.

The previous prime is 21011055419. The next prime is 21011055467. The reversal of 21011055435 is 53455011012.

21011055435 is a `hidden beast` number, since 2 + 1 + 0 + 110 + 5 + 543 + 5 = 666.

It is not a de Polignac number, because 21011055435 - 2⁴ = 21011055419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011055399 and 21011055408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233456127 + ... + 233456216.

It is an arithmetic number, because the mean of its divisors is an integer number (3034930236).

Almost surely, 2^21011055435 is an apocalyptic number.

21011055435 is a deficient number, since it is larger than the sum of its proper divisors (15408107397).

21011055435 is a wasteful number, since it uses less digits than its factorization.

21011055435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466912354 (or 466912351 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 21011055435 its reverse (53455011012), we get a palindrome (74466066447).

The spelling of 21011055435 in words is "twenty-one billion, eleven million, fifty-five thousand, four hundred thirty-five".