21554150 has 12 divisors (see below), whose sum is σ = 40090812. Its totient is φ = 8621640.

The previous prime is 21554149. The next prime is 21554161. The reversal of 21554150 is 5145512.

It is a happy number.

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 215492 + ... + 215591.

It is an arithmetic number, because the mean of its divisors is an integer number (3340901).

Almost surely, 2^21554150 is an apocalyptic number.

21554150 is a deficient number, since it is larger than the sum of its proper divisors (18536662).

21554150 is a wasteful number, since it uses less digits than its factorization.

21554150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431095 (or 431090 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 21554150 is about 4642.6447204153. The cubic root of 21554150 is about 278.2981377882.

Adding to 21554150 its reverse (5145512), we get a palindrome (26699662).

The spelling of 21554150 in words is "twenty-one million, five hundred fifty-four thousand, one hundred fifty".