21205889066 has 32 divisors (see below), whose sum is σ = 33136128000. Its totient is φ = 10165804992.

The previous prime is 21205889051. The next prime is 21205889093. The reversal of 21205889066 is 66098850212.

It is a self number, because there is not a number n which added to its sum of digits gives 21205889066.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13277780 + ... + 13279376.

It is an arithmetic number, because the mean of its divisors is an integer number (1035504000).

Almost surely, 2^21205889066 is an apocalyptic number.

21205889066 is a deficient number, since it is larger than the sum of its proper divisors (11930238934).

21205889066 is a wasteful number, since it uses less digits than its factorization.

21205889066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 21205889066 in words is "twenty-one billion, two hundred five million, eight hundred eighty-nine thousand, sixty-six".