21035210045 has 8 divisors (see below), whose sum is σ = 25309927896. Its totient is φ = 16783050816.

The previous prime is 21035210017. The next prime is 21035210051. The reversal of 21035210045 is 54001253012.

It can be written as a sum of positive squares in 4 ways, for example, as 17749369 + 21017460676 = 4213^2 + 144974^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21035210045 - 2¹² = 21035205949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21035210045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5637602 + ... + 5641331.

It is an arithmetic number, because the mean of its divisors is an integer number (3163740987).

Almost surely, 2^21035210045 is an apocalyptic number.

It is an amenable number.

21035210045 is a deficient number, since it is larger than the sum of its proper divisors (4274717851).

21035210045 is a wasteful number, since it uses less digits than its factorization.

21035210045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11279311.

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

Adding to 21035210045 its reverse (54001253012), we get a palindrome (75036463057).

The spelling of 21035210045 in words is "twenty-one billion, thirty-five million, two hundred ten thousand, forty-five".