21745031633055 has 48 divisors (see below), whose sum is σ = 39135682928160. Its totient is φ = 11583014266368.

The previous prime is 21745031632993. The next prime is 21745031633089. The reversal of 21745031633055 is 55033613054712.

21745031633055 is a `hidden beast` number, since 2 + 1 + 7 + 4 + 5 + 0 + 3 + 1 + 633 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 21745031633055 - 2¹⁷ = 21745031501983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21745031633055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10078342 + ... + 12044211.

It is an arithmetic number, because the mean of its divisors is an integer number (815326727670).

Almost surely, 2^{21745031633055} is an apocalyptic number.

21745031633055 is a deficient number, since it is larger than the sum of its proper divisors (17390651295105).

21745031633055 is an equidigital number, since it uses as much as digits as its factorization.

21745031633055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22123382 (or 22123370 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 45.

Adding to 21745031633055 its reverse (55033613054712), we get a palindrome (76778644687767).

The spelling of 21745031633055 in words is "twenty-one trillion, seven hundred forty-five billion, thirty-one million, six hundred thirty-three thousand, fifty-five".