21209061000 has 64 divisors (see below), whose sum is σ = 66172279680. Its totient is φ = 5655748800.

The previous prime is 21209060993. The next prime is 21209061043. The reversal of 21209061000 is 16090212.

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, 3531844 + ... + 3537843.

It is an arithmetic number, because the mean of its divisors is an integer number (1033941870).

Almost surely, 2^21209061000 is an apocalyptic number.

21209061000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21209061000 is an abundant number, since it is smaller than the sum of its proper divisors (44963218680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21209061000 is a wasteful number, since it uses less digits than its factorization.

21209061000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7069711 (or 7069697 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The spelling of 21209061000 in words is "twenty-one billion, two hundred nine million, sixty-one thousand".