21653553301252 has 12 divisors (see below), whose sum is σ = 38817955308636. Its totient is φ = 10562708927360.

The previous prime is 21653553301213. The next prime is 21653553301283. The reversal of 21653553301252 is 25210335535612.

It can be written as a sum of positive squares in 2 ways, for example, as 10575399936256 + 11078153364996 = 3251984^2 + 3328386^2 .

It is a super-2 number, since 2×21653553301252² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21653553301199 and 21653553301208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66016930633 + ... + 66016930960.

It is an arithmetic number, because the mean of its divisors is an integer number (3234829609053).

Almost surely, 2^{21653553301252} is an apocalyptic number.

It is an amenable number.

21653553301252 is a deficient number, since it is larger than the sum of its proper divisors (17164402007384).

21653553301252 is a wasteful number, since it uses less digits than its factorization.

21653553301252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132033861638 (or 132033861636 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 43.

Adding to 21653553301252 its reverse (25210335535612), we get a palindrome (46863888836864).

The spelling of 21653553301252 in words is "twenty-one trillion, six hundred fifty-three billion, five hundred fifty-three million, three hundred one thousand, two hundred fifty-two".