21200154 has 8 divisors (see below), whose sum is σ = 42400320. Its totient is φ = 7066716.

The previous prime is 21200147. The next prime is 21200171. The reversal of 21200154 is 45100212.

It is a sphenic number, since it is the product of 3 distinct primes.

21200154 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 1766674 + ... + 1766685.

It is an arithmetic number, because the mean of its divisors is an integer number (5300040).

Almost surely, 2^21200154 is an apocalyptic number.

21200154 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21200154 is a wasteful number, since it uses less digits than its factorization.

21200154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3533364.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 21200154 is about 4604.3624965895. The cubic root of 21200154 is about 276.7661708827.

Adding to 21200154 its reverse (45100212), we get a palindrome (66300366).

The spelling of 21200154 in words is "twenty-one million, two hundred thousand, one hundred fifty-four".