21653051450366 has 16 divisors (see below), whose sum is σ = 37126037111904. Its totient is φ = 9278249108064.

The previous prime is 21653051450357. The next prime is 21653051450377. The reversal of 21653051450366 is 66305415035612.

It is a super-2 number, since 2×21653051450366² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21653051450366.

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, 135757865 + ... + 135917268.

It is an arithmetic number, because the mean of its divisors is an integer number (2320377319494).

Almost surely, 2^{21653051450366} is an apocalyptic number.

21653051450366 is a deficient number, since it is larger than the sum of its proper divisors (15472985661538).

21653051450366 is a wasteful number, since it uses less digits than its factorization.

21653051450366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271680835.

The product of its (nonzero) digits is 1944000, while the sum is 47.

Adding to 21653051450366 its reverse (66305415035612), we get a palindrome (87958466485978).

The spelling of 21653051450366 in words is "twenty-one trillion, six hundred fifty-three billion, fifty-one million, four hundred fifty thousand, three hundred sixty-six".