21053024305 has 8 divisors (see below), whose sum is σ = 25264409832. Its totient is φ = 16841899008.

The previous prime is 21053024297. The next prime is 21053024323. The reversal of 21053024305 is 50342035012.

It can be written as a sum of positive squares in 4 ways, for example, as 13478281216 + 7574743089 = 116096^2 + 87033^2 .

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 21053024305 - 2³ = 21053024297 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 21053024305.

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, 267217 + ... + 336913.

It is an arithmetic number, because the mean of its divisors is an integer number (3158051229).

Almost surely, 2^21053024305 is an apocalyptic number.

It is an amenable number.

21053024305 is a deficient number, since it is larger than the sum of its proper divisors (4211385527).

21053024305 is an equidigital number, since it uses as much as digits as its factorization.

21053024305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130115.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 21053024305 its reverse (50342035012), we get a palindrome (71395059317).

The spelling of 21053024305 in words is "twenty-one billion, fifty-three million, twenty-four thousand, three hundred five".