21004553035 has 8 divisors (see below), whose sum is σ = 25618668336. Its totient is φ = 16528172640.

The previous prime is 21004553027. The next prime is 21004553039. The reversal of 21004553035 is 53035540012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21004553035 - 2³ = 21004553027 is a prime.

It is a super-2 number, since 2×21004553035² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21004552994 and 21004553012.

It is not an unprimeable number, because it can be changed into a prime (21004553039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34433389 + ... + 34433998.

It is an arithmetic number, because the mean of its divisors is an integer number (3202333542).

Almost surely, 2^21004553035 is an apocalyptic number.

21004553035 is a deficient number, since it is larger than the sum of its proper divisors (4614115301).

21004553035 is an equidigital number, since it uses as much as digits as its factorization.

21004553035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68867453.

The product of its (nonzero) digits is 9000, while the sum is 28.

The spelling of 21004553035 in words is "twenty-one billion, four million, five hundred fifty-three thousand, thirty-five".