21655044241053 has 4 divisors (see below), whose sum is σ = 28873392321408. Its totient is φ = 14436696160700.

The previous prime is 21655044241021. The next prime is 21655044241063. The reversal of 21655044241053 is 35014244055612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21655044241053 - 2⁵ = 21655044241021 is a prime.

It is a super-5 number, since 5×21655044241053⁵ (a number of 68 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21655044240996 and 21655044241014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655044241063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3609174040173 + ... + 3609174040178.

It is an arithmetic number, because the mean of its divisors is an integer number (7218348080352).

Almost surely, 2^{21655044241053} is an apocalyptic number.

It is an amenable number.

21655044241053 is a deficient number, since it is larger than the sum of its proper divisors (7218348080355).

21655044241053 is an equidigital number, since it uses as much as digits as its factorization.

21655044241053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7218348080354.

The product of its (nonzero) digits is 576000, while the sum is 42.

Adding to 21655044241053 its reverse (35014244055612), we get a palindrome (56669288296665).

The spelling of 21655044241053 in words is "twenty-one trillion, six hundred fifty-five billion, forty-four million, two hundred forty-one thousand, fifty-three".