21055543627 has 2 divisors, whose sum is σ = 21055543628. Its totient is φ = 21055543626.

The previous prime is 21055543603. The next prime is 21055543657. The reversal of 21055543627 is 72634555012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21055543627 - 2¹⁵ = 21055510859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21055543627.

It is not a weakly prime, because it can be changed into another prime (21055543657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10527771813 + 10527771814.

It is an arithmetic number, because the mean of its divisors is an integer number (10527771814).

Almost surely, 2^21055543627 is an apocalyptic number.

21055543627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055543627 is an equidigital number, since it uses as much as digits as its factorization.

21055543627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 21055543627 in words is "twenty-one billion, fifty-five million, five hundred forty-three thousand, six hundred twenty-seven".