21567190105 has 16 divisors (see below), whose sum is σ = 26389978560. Its totient is φ = 16915756608.

The previous prime is 21567190093. The next prime is 21567190121. The reversal of 21567190105 is 50109176512.

It is a cyclic number.

It is not a de Polignac number, because 21567190105 - 2⁷ = 21567189977 is a prime.

It is a super-2 number, since 2×21567190105² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12034 + ... + 208036.

It is an arithmetic number, because the mean of its divisors is an integer number (1649373660).

Almost surely, 2^21567190105 is an apocalyptic number.

It is an amenable number.

21567190105 is a deficient number, since it is larger than the sum of its proper divisors (4822788455).

21567190105 is a wasteful number, since it uses less digits than its factorization.

21567190105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196440.

The product of its (nonzero) digits is 18900, while the sum is 37.

The spelling of 21567190105 in words is "twenty-one billion, five hundred sixty-seven million, one hundred ninety thousand, one hundred five".