21200860 has 12 divisors (see below), whose sum is σ = 44521848. Its totient is φ = 8480336.

The previous prime is 21200831. The next prime is 21200867. The reversal of 21200860 is 6800212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530002 + ... + 530041.

It is an arithmetic number, because the mean of its divisors is an integer number (3710154).

Almost surely, 2^21200860 is an apocalyptic number.

21200860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200860 is an abundant number, since it is smaller than the sum of its proper divisors (23320988).

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

21200860 is a wasteful number, since it uses less digits than its factorization.

21200860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060052 (or 1060050 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21200860 is about 4604.4391623736. The cubic root of 21200860 is about 276.7692431049.

It can be divided in two parts, 21 and 200860, that multiplied together give a triangular number (4218060 = T₂₉₀₄).

The spelling of 21200860 in words is "twenty-one million, two hundred thousand, eight hundred sixty".