21200859858 has 16 divisors (see below), whose sum is σ = 42446791296. Its totient is φ = 7059441360.

The previous prime is 21200859853. The next prime is 21200859859. The reversal of 21200859858 is 85895800212.

It is not an unprimeable number, because it can be changed into a prime (21200859853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1871866 + ... + 1883157.

It is an arithmetic number, because the mean of its divisors is an integer number (2652924456).

Almost surely, 2^21200859858 is an apocalyptic number.

21200859858 is an abundant number, since it is smaller than the sum of its proper divisors (21245931438).

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

21200859858 is a wasteful number, since it uses less digits than its factorization.

21200859858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3755969.

The product of its (nonzero) digits is 460800, while the sum is 48.

The spelling of 21200859858 in words is "twenty-one billion, two hundred million, eight hundred fifty-nine thousand, eight hundred fifty-eight".