21055565607063 has 16 divisors (see below), whose sum is σ = 30234220813440. Its totient is φ = 12957019079904.

The previous prime is 21055565607061. The next prime is 21055565607071. The reversal of 21055565607063 is 36070656555012.

It is not a de Polignac number, because 21055565607063 - 2¹ = 21055565607061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21055565606997 and 21055565607015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21055565607061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3210781 + ... + 7240182.

It is an arithmetic number, because the mean of its divisors is an integer number (1889638800840).

Almost surely, 2^{21055565607063} is an apocalyptic number.

21055565607063 is a deficient number, since it is larger than the sum of its proper divisors (9178655206377).

21055565607063 is a wasteful number, since it uses less digits than its factorization.

21055565607063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10502638.

The product of its (nonzero) digits is 5670000, while the sum is 51.

The spelling of 21055565607063 in words is "twenty-one trillion, fifty-five billion, five hundred sixty-five million, six hundred seven thousand, sixty-three".