21201886 has 16 divisors (see below), whose sum is σ = 32497200. Its totient is φ = 10371328.

The previous prime is 21201811. The next prime is 21201889. The reversal of 21201886 is 68810212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201889) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 41400 + ... + 41908.

It is an arithmetic number, because the mean of its divisors is an integer number (2031075).

Almost surely, 2^21201886 is an apocalyptic number.

21201886 is a deficient number, since it is larger than the sum of its proper divisors (11295314).

21201886 is a wasteful number, since it uses less digits than its factorization.

21201886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 21201886 is about 4604.5505752462. The cubic root of 21201886 is about 276.7737077141.

The spelling of 21201886 in words is "twenty-one million, two hundred one thousand, eight hundred eighty-six".