21652613052145 has 8 divisors (see below), whose sum is σ = 25983359032680. Its totient is φ = 17321941528320.

The previous prime is 21652613052139. The next prime is 21652613052151. The reversal of 21652613052145 is 54125031625612.

It is an interprime number because it is at equal distance from previous prime (21652613052139) and next prime (21652613052151).

It can be written as a sum of positive squares in 4 ways, for example, as 2636106184881 + 19016506867264 = 1623609^2 + 4360792^2 .

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

It is not a de Polignac number, because 21652613052145 - 2³ = 21652613052137 is a prime.

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, 17972386 + ... + 19139275.

It is an arithmetic number, because the mean of its divisors is an integer number (3247919879085).

Almost surely, 2^{21652613052145} is an apocalyptic number.

It is an amenable number.

21652613052145 is a deficient number, since it is larger than the sum of its proper divisors (4330745980535).

21652613052145 is a wasteful number, since it uses less digits than its factorization.

21652613052145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37228355.

The product of its (nonzero) digits is 432000, while the sum is 43.

Adding to 21652613052145 its reverse (54125031625612), we get a palindrome (75777644677757).

The spelling of 21652613052145 in words is "twenty-one trillion, six hundred fifty-two billion, six hundred thirteen million, fifty-two thousand, one hundred forty-five".