21105365061 has 16 divisors (see below), whose sum is σ = 31757290560. Its totient is φ = 12350056320.

The previous prime is 21105365059. The next prime is 21105365063. The reversal of 21105365061 is 16056350112.

It is an interprime number because it is at equal distance from previous prime (21105365059) and next prime (21105365063).

It is not a de Polignac number, because 21105365061 - 2¹ = 21105365059 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105365063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11025880 + ... + 11027793.

It is an arithmetic number, because the mean of its divisors is an integer number (1984830660).

Almost surely, 2^21105365061 is an apocalyptic number.

It is an amenable number.

21105365061 is a deficient number, since it is larger than the sum of its proper divisors (10651925499).

21105365061 is a wasteful number, since it uses less digits than its factorization.

21105365061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22053716.

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 21105365061 in words is "twenty-one billion, one hundred five million, three hundred sixty-five thousand, sixty-one".