21554196 has 12 divisors (see below), whose sum is σ = 50293152. Its totient is φ = 7184728.

The previous prime is 21554177. The next prime is 21554209. The reversal of 21554196 is 69145512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 898080 + ... + 898103.

It is an arithmetic number, because the mean of its divisors is an integer number (4191096).

Almost surely, 2^21554196 is an apocalyptic number.

It is an amenable number.

21554196 is an abundant number, since it is smaller than the sum of its proper divisors (28738956).

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

21554196 is a wasteful number, since it uses less digits than its factorization.

21554196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796190 (or 1796188 counting only the distinct ones).

The product of its digits is 10800, while the sum is 33.

The square root of 21554196 is about 4642.6496744855. The cubic root of 21554196 is about 278.2983357656.

The spelling of 21554196 in words is "twenty-one million, five hundred fifty-four thousand, one hundred ninety-six".