21053024145245 has 8 divisors (see below), whose sum is σ = 25740301219416. Its totient is φ = 16524637819456.

The previous prime is 21053024145203. The next prime is 21053024145269. The reversal of 21053024145245 is 54254142035012.

It can be written as a sum of positive squares in 4 ways, for example, as 1145882470681 + 19907141674564 = 1070459^2 + 4461742^2 .

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 21053024145245 - 2²⁶ = 21052957036381 is a prime.

It is a super-2 number, since 2×21053024145245² (a number of 27 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 = 21053024145199 and 21053024145208.

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, 39722686802 + ... + 39722687331.

It is an arithmetic number, because the mean of its divisors is an integer number (3217537652427).

Almost surely, 2^{21053024145245} is an apocalyptic number.

It is an amenable number.

21053024145245 is a deficient number, since it is larger than the sum of its proper divisors (4687277074171).

21053024145245 is an equidigital number, since it uses as much as digits as its factorization.

21053024145245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79445374191.

The product of its (nonzero) digits is 192000, while the sum is 38.

The spelling of 21053024145245 in words is "twenty-one trillion, fifty-three billion, twenty-four million, one hundred forty-five thousand, two hundred forty-five".